Fix custom payload typo

[nam054]

Description

Fixes a typo which causes plan to fail.

Relations

Closes #35670

References

Output from Acceptance Testing

> make testacc TESTS=TestAccLexV2ModelsSlot_ PKG=lexv2models
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.21.8 test ./internal/service/lexv2models/... -v -count 1 -parallel 20 -run='TestAccLexV2ModelsSlot_'  -timeout 360m
=== RUN   TestAccLexV2ModelsSlot_basic
=== PAUSE TestAccLexV2ModelsSlot_basic
=== RUN   TestAccLexV2ModelsSlot_updateMultipleValuesSetting
=== PAUSE TestAccLexV2ModelsSlot_updateMultipleValuesSetting
=== RUN   TestAccLexV2ModelsSlot_ObfuscationSetting
=== PAUSE TestAccLexV2ModelsSlot_ObfuscationSetting
=== RUN   TestAccLexV2ModelsSlot_disappears
=== PAUSE TestAccLexV2ModelsSlot_disappears
=== CONT  TestAccLexV2ModelsSlot_basic
=== CONT  TestAccLexV2ModelsSlot_ObfuscationSetting
=== CONT  TestAccLexV2ModelsSlot_updateMultipleValuesSetting
=== CONT  TestAccLexV2ModelsSlot_disappears
--- PASS: TestAccLexV2ModelsSlot_disappears (40.94s)
--- PASS: TestAccLexV2ModelsSlot_ObfuscationSetting (47.35s)
--- PASS: TestAccLexV2ModelsSlot_basic (49.56s)
--- PASS: TestAccLexV2ModelsSlot_updateMultipleValuesSetting (57.93s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/lexv2models        63.662s

...

[github-actions]

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[github-actions]

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[github-actions]

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