custom_check: Remove exclusions for comment annotations check.
custom_check: Remove exclusions for comment annotations check.

Commit 27621211624d8b51b3faaa63a196acd5859a0406 (#21552) made them
unnecessary.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulip.com>

zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip