make properties use guild_id attribute instead of calling other 2 functions

Author: Snipy7374

Diff for: disnake/emoji.py

@@ -182,7 +182,7 @@ def application_id(self) -> Optional[int]:
 
         .. versionadded:: 2.11
         """
-        if self.guild is None:
+        if self.guild_id is None:
             return None
         return self._state.application_id
 
@@ -192,7 +192,7 @@ def is_app_emoji(self) -> bool:
 
         .. versionadded:: 2.11
         """
-        if self.guild is None:
+        if self.guild_id is None:
             return True
         return False