FIX: prevent re-flagging when we have reviewed flags before (PR #10010)

Fixes an edge case where a review can be reflagged when: User flags as inappropriate. Moderator rejects the flag. Another user re-flags the post as spam.

Before, anyone was able to re-flag as inappropriate despite it being flagged previously. With this, users are unable to re-flag for the same reason regardless of reviewable status.


Good catch!