Log Message:
graphics/kvantum: update to 0.16.0

V0.16.0
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 * Set the scroll indicator size of tabs to that of toolbar buttons.
 * Fixed a rare issue in the frame size of grouped elements.
 * Added an option to Kvantum Manager for enabling window translucency with
 non-integer scale factors after showing a warning.
 * A workaround for a rare case of Qt's contradicting QStyle in drawing spin
 boxes.
 * Fixed the height of combo menu separators.
 * Reset widget palettes on changing style from and to Kvantum. This fixes
 several problems with on-the-fly style changes, so that an app restart won't be
 needed in most cases.
 * Updated the code for Qt 5.15.
 * Added a workaround for a regression in Qt 5.15, which results in
 QStyleOptionTab reporting an incorrect tab position.