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[44] monitor-manager/xrandr: Check DPMS state before calling DPMSForceLevel()

Alynx Zhou requested to merge AlynxZhou/mutter:check-dpms-state-44 into gnome-44

According to Xorg docs 1, BadMatch error returned by DPMSForceLevel() means DPMS is disabled, so check DPMS state before calling it, like what we already done in meta_monitor_manager_xrandr_read_current_state().

Fixes: gnome-shell#6883 (closed), #2857 (closed)

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