shell: refresh geometries of all DesktopView and PanelView when receiving logicalDotsPerInchChanged
BUG: 450443 FIXED-IN: 5.24.6
Ref: plasma-desktop#34 (closed)
See also: https://codereview.qt-project.org/c/qt/qtbase/+/413380
Test:
- Only the right screen is enabled, enable the left screen.
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- Two screens are enabled, disable the left screen.
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