emit QScreen::geometryChanged when the logical DPI changes

emit QScreen::geometryChanged when the logical DPI changes

Origin: upstream, https://code.qt.io/cgit/qt/qtbase.git/commit/?id=5c7307775d32ae0a
Last-Update: 2020-09-30

Add the missing call to QScreenPrivate::emitGeometryChangeSignals()
along with an emission of physicalDotsPerInchChanged()
since that is calculated from geometry and physical size.

Rearrange the code in
QGuiApplicationPrivate::processScreenGeometryChange()
to prevent duplicate emissions of geometryChanged(),
physicalDotsPerInchChanged() which this change would introduce.

Gbp-Pq: Name emit_geometry_changed.diff