API handler: don't force the IdentityLabel flag

Don't force the IdentityLabel option one way or another when the client
doesn't specifically request one or the other, so that the server can
choose to use its default behavior.

Fixes #26669

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f