power: return output id when changing screen brightness
When StepUp() or StepDown() are called to change the screen brightness, also return the output id where the brightness transition happened (if any). This is useful so that the shell can show the OSD only on the relevant monitor, which will be done in the next commit. https://bugzilla.gnome.org/show_bug.cgi?id=704086
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a653c34b
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