transfer: Fix erroneous diffs with user and access policies

[YakDriver]

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Relates #21968

Output from acceptance testing (us-west-2):

% make testacc TESTS="TestAccTransfer_serial/User" PKG=transfer
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/transfer/... -v -count 1 -parallel 20 -run='TestAccTransfer_serial/User' -timeout 180m
--- PASS: TestAccTransfer_serial (995.77s)
    --- PASS: TestAccTransfer_serial/User (995.77s)
        --- PASS: TestAccTransfer_serial/User/UserNameValidation (15.56s)
        --- PASS: TestAccTransfer_serial/User/basic (189.83s)
        --- PASS: TestAccTransfer_serial/User/disappears (161.57s)
        --- PASS: TestAccTransfer_serial/User/HomeDirectoryMappings (203.89s)
        --- PASS: TestAccTransfer_serial/User/ModifyWithOptions (224.92s)
        --- PASS: TestAccTransfer_serial/User/Posix (200.00s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/transfer	997.362s

Output from acceptance testing (GovCloud):

% make testacc TESTS="TestAccTransfer_serial/Access" PKG=transfer
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/transfer/... -v -count 1 -parallel 20 -run='TestAccTransfer_serial/Access' -timeout 180m
--- PASS: TestAccTransfer_serial (20.48s)
    --- PASS: TestAccTransfer_serial/Access (20.48s)
        --- SKIP: TestAccTransfer_serial/Access/S3Basic (2.72s)
        --- SKIP: TestAccTransfer_serial/Access/S3Policy (1.07s)
        --- SKIP: TestAccTransfer_serial/Access/disappears (1.06s)
        --- SKIP: TestAccTransfer_serial/Access/EFSBasic (15.64s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/transfer	21.662s
% make testacc TESTS="TestAccTransfer_serial/User" PKG=transfer
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/transfer/... -v -count 1 -parallel 20 -run='TestAccTransfer_serial/User' -timeout 180m
--- PASS: TestAccTransfer_serial (70.53s)
    --- PASS: TestAccTransfer_serial/User (70.53s)
        --- SKIP: TestAccTransfer_serial/User/ModifyWithOptions (12.54s)
        --- SKIP: TestAccTransfer_serial/User/Posix (10.62s)
        --- PASS: TestAccTransfer_serial/User/UserNameValidation (15.65s)
        --- SKIP: TestAccTransfer_serial/User/basic (10.56s)
        --- SKIP: TestAccTransfer_serial/User/disappears (10.57s)
        --- SKIP: TestAccTransfer_serial/User/HomeDirectoryMappings (10.57s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/transfer	71.759s

[ewbankkit]

LGTM 🚀.

% make testacc TESTS="TestAccTransfer_serial/User" PKG=transfer
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/transfer/... -v -count 1 -parallel 20 -run='TestAccTransfer_serial/User' -timeout 180m
=== RUN   TestAccTransfer_serial
=== RUN   TestAccTransfer_serial/User
=== RUN   TestAccTransfer_serial/User/basic
=== RUN   TestAccTransfer_serial/User/disappears
=== RUN   TestAccTransfer_serial/User/HomeDirectoryMappings
=== RUN   TestAccTransfer_serial/User/ModifyWithOptions
=== RUN   TestAccTransfer_serial/User/Posix
=== RUN   TestAccTransfer_serial/User/UserNameValidation
--- PASS: TestAccTransfer_serial (987.11s)
    --- PASS: TestAccTransfer_serial/User (987.11s)
        --- PASS: TestAccTransfer_serial/User/basic (189.90s)
        --- PASS: TestAccTransfer_serial/User/disappears (156.69s)
        --- PASS: TestAccTransfer_serial/User/HomeDirectoryMappings (209.58s)
        --- PASS: TestAccTransfer_serial/User/ModifyWithOptions (220.82s)
        --- PASS: TestAccTransfer_serial/User/Posix (197.77s)
        --- PASS: TestAccTransfer_serial/User/UserNameValidation (12.35s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/transfer	990.482s

[github-actions]

This functionality has been released in v3.70.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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