Chaingun sound loops when pressing escape

[darkcharmander]

When shooting the Chaingun, the sound will loop whenever you open the menu while shooting. It will stop afterwards.
Attached is a small video which clearly shows this issue. (I had to zip it, because Github refuses MP4...)
Chaingun Sound Glitch.zip

[DanielGibson]

I think this is fixed, can you try out the testbuild linked in #363 ?
Thanks!

[darkcharmander]

I've tested the mentioned build, and the glitch is no longer present. Good job!