remove path_matchers conflicts

[c2thorn]

fixes hashicorp/terraform-provider-google#6695

Tested with the user's example config

Release Note Template for Downstream PRs (will be copied)

compute: fixed an issue in `compute_url_map` where `path_matcher` sub-fields would conflict with `default_service`

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 1 file changed, 1 insertion(+), 2 deletions(-))
Terraform Beta: Diff ( 1 file changed, 1 insertion(+), 2 deletions(-))

[modular-magician]

I have triggered VCR tests based on this PR's diffs. See the results here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=129581"

[modular-magician]

I have triggered VCR tests in RECORDING mode for the following tests that failed during VCR: TestAccFolderIamAuditConfig_multiple You can view the result here: "https://ci-oss.hashicorp.engineering/viewQueued.html?itemId=129582"

[megan07]

LGTM! Thanks!