Fixing with audio issues

Finally figured out an issue with the thruster audio overlapping and playing multiple times when holding down the up arrow key. Turns out it was in the wrong event and has been moved to a separate event that stopped the overlapping issue!

Fixes to the issues and separated events.

Sound fix! Lander is no longer haunted by a loud overlapping of torturous thruster sounds! and the audio stop when the up arrow key is let go!