backend/drm: re-use previous mode blob if it didn't change
If the old mode is the same as the new one, we don't need to re-create the mode blob. This happens when the compositor calls wlr_output_set_mode() at startup, for instance.
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If the old mode is the same as the new one, we don't need to re-create the mode blob. This happens when the compositor calls wlr_output_set_mode() at startup, for instance.