PanelView: Fix popups position when NoBackground hint is set
requested to merge luisbocanegra/plasma-workspace:work/luisbocanegra/fix-popup-position-nobackground-hint into master
After libplasma!1148 (merged), part of !4451 (merged) popups now align to the mask, without it they appear in the wrong position.
This change makes the mask always be filled with with panelMask
instead of using an empty one if background hint Plasma::Types::NoBackgroundis set
Tested with this plasmoid https://github.com/sanjay-kr-commit/panelTransparencyToggleForPlasma6
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