Change input-* device icon styles, add 16px icons
Summary:
devices/16 was missing some input-* icons.
input-keyboard-virtual looked more like a wireless keyboard than a virtual keyboard.
Changed input-keyboard* style so that it could appear consistent at 16 and 22px. It also looks a bit more like a real keyboard.
Made dialog-input-devices more similar to the hicolor symbolic version for Inkscape (mouse and tablet)
Made configure-shortcuts icon look good at 16px.
Test Plan:
Reviewers: VDG, ngraham
Reviewed By: VDG, ngraham
Subscribers: ngraham, kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D20708
