Fixed releasing a Power window button from midi. Regression from 7ff2ffdd5063472b8dd791d3c088f7c7b849545a
Fix logic duplication between LegacySkinParser and WPushButton.
Not sure when setControlParameter/resetControlParameter ended up only addressing a subset of connections but they should address all.
Merge remote-tracking branch 'upstream/master' into wpushbutton_default

Conflicts:
	src/widget/wbasewidget.cpp
	src/widget/wpushbutton.cpp