backends/drm: Make drm backend not touch output configuration if all outputs are disabled

This behavior was added in order to fix a crash reported in bug report 442990. However, the analysis was not 100% correct, kwin failed to create a placeholder because the relevant check was incorrect. The drm backend was checking the list of all connected outputs rather than the list with enabled outputs to decide whether to create a placeholder output.

As a safety measure the proposed behavior makes sense, however the drm backend is not the right layer to implement it. If the last enabled output is disconnected, kscreen should view it as a new output setup and re-enable outputs in order to ask user what desired output configuration should be.