Coding Standards: Remove extra `unset()` in `rest_handle_options_requ… #40094

Job	Run time
JavaScript coding standards / Run coding standards checks	1m 1s
PHP coding standards / Run coding standards checks	1m 13s
Slack Notifications / Prepare notifications	3s
Slack Notifications / Success notifications	2s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Failure notifications	0s
Slack Notifications / Cancelled notifications	0s
Failed workflow tasks	0s
	2m 19s

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