kcm/rules: Improve "Ignore Geometry" property UI

Merged Ismael Asensio requested to merge work/iasensio/rules-ignore-geometry into master

This property is not used on Wayland because windows are already not allowed to set their own geometry, so let's hide it from the UI.

Also update the tooltip to explicitly state which properties the Ignore Geometry property does affect on X11

BUG: 431265 FIXED-IN: 6.0

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