[12674] Rework StopMove to not start movement if already stopped

thx to Schmoozerd for hint
thx to rsa for pointing to bug

Signed-off-by: Schmoozerd <schmoozerd@cmangos>

src/game/WaypointMovementGenerator.cpp

@@ -320,7 +320,7 @@ void FlightPathMovementGenerator::Finalize(Player& player)
         // update z position to ground and orientation for landing point
         // this prevent cheating with landing  point at lags
         // when client side flight end early in comparison server side
-        player.StopMoving();
+        player.StopMoving(true);
     }
 }