Fix custom emojis in confirm_thread_creation_deny, resolves #2916

Author: fourjr

CHANGELOG.md

@@ -28,7 +28,8 @@ however, insignificant breaking changes do not guarantee a major version bump, s
 - Level permissions were not checked if command permissions were set.
 - Regex autotriggers were not working if term was in the middle of strings.
 - `?blocked` now no longers show blocks that have expired.
-- Blocked roles will no longer trigger an error during unblock
+- Blocked roles will no longer trigger an error during unblock.
+- Custom emojis are now supported in `confirm_thread_creation_deny`. ([GH #2916](https://github.com/kyb3r/modmail/issues/2916))
 
 ### Internal
 

core/thread.py

@@ -1201,7 +1201,7 @@ async def create(
                 del self.cache[recipient.id]
                 return thread
             else:
-                if r.emoji == deny_emoji:
+                if str(r.emoji) == deny_emoji:
                     thread.cancelled = True
 
                     await confirm.remove_reaction(accept_emoji, self.bot.user)