Add more icon sizes for audio, configure, distribute

Summary: The tooltip for the audio system tray widget and panel edit mode had blurry versions of these icons because the icons were being scaled to fit.

Test Plan:
audio.svg:

configure.svg:

distribute.svg:

Reviewers: VDG, Plasma, ngraham

Reviewed By: VDG, ngraham

Subscribers: ngraham, kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D20695