misc: cleanup set_currentRenderingDeviceType

The media is already stored in the call info.
Moreover, no need to hide "share monitor" when we are sharing
the screen, because we may want to switch between a monitor
and a window (or a file) and it should work.

Change-Id: I3db04f1fb11288f4a3288f4430e23704a71bdb3c
GitLab: #587