Camera not closed correctly after 2nd screen-share

Scenario

• Start a video call
• Start sharing screen
• Stop sharing screen
• Start sharing screen
• Close call

Current result

Camera is still opened (but video unused)

Expected

Camera MUST be closed

added SprintTo review bug labels

assigned to @sblin

added 1h of time spent

mentioned in commit 0af4af16

removed SprintTo review label

closed