Core/Guilds: Players should be removed from guild when changing faction

Closes #4623

src/server/game/Server/Protocol/Handlers/CharacterHandler.cpp

@@ -1800,7 +1800,9 @@ void WorldSession::HandleCharFactionOrRaceChange(WorldPacket& recv_data)
         if (!sWorld->getBoolConfig(CONFIG_ALLOW_TWO_SIDE_INTERACTION_GUILD))
         {
             // Reset guild
-            trans->PAppend("DELETE FROM `guild_member` WHERE `guid`= '%u'", lowGuid);
+            if (QueryResult result = CharacterDatabase.PQuery("SELECT guildid FROM `guild_member` WHERE guid ='%u'", lowGuid))
+                if (Guild* guild = sGuildMgr->GetGuildById((result->Fetch()[0]).GetUInt32()))
+                    guild->DeleteMember(MAKE_NEW_GUID(lowGuid, 0, HIGHGUID_PLAYER));
         }
 
         if (!sWorld->getBoolConfig(CONFIG_ALLOW_TWO_SIDE_ADD_FRIEND))