fix: preserve default values in x-goog-request-params header (#403)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 474338479

Source-Link: https://github.com/googleapis/googleapis/commit/d5d35e0353b59719e8917103b1bc7df2782bf6ba

Source-Link: https://github.com/googleapis/googleapis-gen/commit/efcd3f93962a103f68f003e2a1eecde6fa216a27
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiZWZjZDNmOTM5NjJhMTAzZjY4ZjAwM2UyYTFlZWNkZTZmYTIxNmEyNyJ9

gcf-owl-bot[bot] committed 4y ago

af162f09e23d2e850c33bf0af8f77e9302b44e61

Parent: 7e09614

Committed by GitHub <noreply@github.com> on 9/14/2022, 10:42:12 PM