Qt/GeneralWidget and GraphicsWidget: Remove unused member variable #11798
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m_xrr_config was used by the GeneralWidget::GetAvailableResolutions function to get the list of supported fullscreen resolutions when HAVE_XRANDR was set. #6196 removed the ability to set that resolution in the UI, leaving the GetAvailableResolutions function unused. I'm removing that function in #11797.
m_xrr_config is initialized in MainWindow which still uses it to toggle fullscreen, but the references in GeneralWidget and GraphicsWidget (which just ferried m_xrr_config from MainWindow to GeneralWidget) are now unnecessary and removed in this PR.