xrandr: Fix deleting inactive monitors
The following commands did not behave correctly: xrandr --setmonitor empty auto none xrandr --delmonitor empty The second command failed with "No monitor named 'empty'". This occurred because get_monitors was invoked with its get_active argument set to False, which caused it to not retrieve inactive monitors. Thus, inactive monitors could not be deleted. Fix this bug by invoking get_monitors (and, thus, XRRGetMonitors) with get_active = False, thus enabling deletion of disabled monitors.