Adjust Volume sliders defualt to 0 on cancel

[MistChristmas]

Testmerges

N/A

Round ID

N/A

Description of the bug

Opening the input box and then just hitting cancel or closing it without confirming an option will set it to 0

What's the difference with what should have happened?

It shouldn't change anything if the user makes no changes

How do we reproduce this bug?

1. Use one of the sliders
2. Exit or cancel without changing a number
3. You have now muted those sounds
   ...

Issue Bingo

• Issue could be reproduced at least once
• Issue happened in a recent (less than 7 days ago) round
• Couldn't find an existing issue about this (https://github.com/cmss13-devs/cmss13/issues)

[Butlerblock]

As an addition to this. It also defaults fps to 30 if you hit cancel.