Core/Players: update mount capabilities on player login to avoid orphaned mount speed auras

src/server/game/Handlers/CharacterHandler.cpp

@@ -981,6 +981,7 @@ void WorldSession::HandlePlayerLogin(LoginQueryHolder* holder)
     }
 
     pCurrChar->UpdatePositionData();
+    pCurrChar->UpdateMountCapabilities();
     pCurrChar->SendInitialPacketsAfterAddToMap();
 
     CharacterDatabasePreparedStatement* stmt = CharacterDatabase.GetPreparedStatement(CHAR_UPD_CHAR_ONLINE);