Mark intent alias flags as actual aliases to skip them in __iter__

Fix Rapptz#5945

Author: Rapptz

discord/flags.py

@@ -594,7 +594,7 @@ def presences(self):
         """
         return 1 << 8
 
-    @flag_value
+    @alias_flag_value
     def messages(self):
         """:class:`bool`: Whether guild and direct message related events are enabled.
 
@@ -677,7 +677,7 @@ def dm_messages(self):
         """
         return 1 << 12
 
-    @flag_value
+    @alias_flag_value
     def reactions(self):
         """:class:`bool`: Whether guild and direct message reaction related events are enabled.
 
@@ -740,7 +740,7 @@ def dm_reactions(self):
         """
         return 1 << 13
 
-    @flag_value
+    @alias_flag_value
     def typing(self):
         """:class:`bool`: Whether guild and direct message typing related events are enabled.