[INTERNAL] m.Select: force focus to stay in the input only on desktop

Force the focus to leave the inner element and set it back to the
control's root element, but only on desktop. There is no need to force
the focus back on mobile, because on mobile the dropdown/picker is a
full screen dialog and should get the focus.

Change-Id: I74fb2160e55fda9aa06adc3eb10eaa765ce311a2
Merge "[INTERNAL] m.Select: force focus to stay in the input only on desktop"