Make KisPopupButton a QToolButton instead of QPushButton
Make KisPopupButton inherit from QToolButton instead of QPushButton, so that we can get the autoRaise style instead of flat style, to make the styling on the toolbar more consistent.
simplescreenrecorder-2021-06-15_16.11.08.mkv
Test Plan
Verify that the popup buttons on the toolbar has the same autoRaise (hover feedback) style as the other tool buttons.
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