show context menu even when there is no video

This fixes the bug that resulted in the context menu (right click)
not showing during a call if there was no outgoing video.

This also fixes a memory leak which happened because a new menu
was being built each time, but the old one was never destroyed.

Change-Id: Ie72fbae05703c708dc91d0ec968aa57c5b8a509f
Tuleap: #1080
2 files changed