fix(gateway): Add missing flag to EventTypeFlags::GUILD_MESSAGES (#…

…2332)

`EventTypeFlag::GUILD_MESSAGES` should include the
`EventTypeFlag::MESSAGE_UPDATE` flag and no duplicated
`EventTypeFlag::MESSAGE_DELETE` flag.

Co-authored-by: Quang Pham <quangphammailbox@gmail.com>

twilight-gateway/src/event.rs

@@ -273,8 +273,8 @@ bitflags! {
         /// [`Intents::GUILD_MESSAGES`]: crate::Intents::GUILD_MESSAGES
         const GUILD_MESSAGES = Self::MESSAGE_CREATE.bits()
             | Self::MESSAGE_DELETE.bits()
-            | Self::MESSAGE_DELETE.bits()
-            | Self::MESSAGE_DELETE_BULK.bits();
+            | Self::MESSAGE_DELETE_BULK.bits()
+            | Self::MESSAGE_UPDATE.bits();
 
         /// All [`EventTypeFlags`] in [`Intents::GUILD_MESSAGE_REACTIONS`].
         ///