Fix typo in find-feature-flags script. Change 'code' _CHOICES array to 'all-code' to match conditional in `_choice_set`.
Pull request: https://github.com/WebKit/WebKit/pull/10102
Committed 260274@main (14312d0b159e): <https://commits.webkit.org/260274@main> Reviewed commits have been landed. Closing PR #10102 and removing active labels.
<rdar://problem/105467383>