UI: Change clip level to 0.0 dB

[cg2121]

Description

This changes the clip level of the volume meters from -0.5 dB to 0.0 dB.

Motivation and Context

I think the original intention was to tell users they had too loud of audio without actually clipping the audio. But if audio was intended to be this high of level, such as music, it would show it was clipping without it actually clipping.

Brought up by @PatTheMav off thread.

How Has This Been Tested?

Tested audio with a high dB level, but not clipping, to make sure the volume controls didn't show the clipping indicators.

Types of changes

• Tweak (non-breaking change to improve existing functionality)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[SuslikV]

Right now it affects only input meter (small rectangle).

[cg2121]

Fixed the code now, so the clip level affects both the input and output meters.