Fix bug in permission resolution when dealing with timed out members

This would lead to timed out members having the read_messages
permission set to True instead of False

discord/abc.py

@@ -845,12 +845,6 @@ class GuildChannel:
         if base.administrator:
             return Permissions.all()
 
-        if obj.is_timed_out():
-            # Timeout leads to every permission except VIEW_CHANNEL and READ_MESSAGE_HISTORY
-            # being explicitly denied
-            base.value &= Permissions._timeout_mask()
-            return base
-
         # Apply @everyone allow/deny first since it's special
         try:
             maybe_everyone = self._overwrites[0]
@@ -892,6 +886,12 @@ class GuildChannel:
             denied = Permissions.all_channel()
             base.value &= ~denied.value
 
+        if obj.is_timed_out():
+            # Timeout leads to every permission except VIEW_CHANNEL and READ_MESSAGE_HISTORY
+            # being explicitly denied
+            # N.B.: This *must* come last, because it's a conclusive mask
+            base.value &= Permissions._timeout_mask()
+
         return base
 
     async def delete(self, *, reason: Optional[str] = None) -> None: