QmlProfiler: Fix toggling of internal client recording state

We cannot just set it unconditionally on setRecording() because the
client recording state is supposed to reflect the user's intention.
Instead, if the recording button's state differs from the intention
and then spontaneously changes to match it (through a change in the
application), we toggle the client recording state twice to make sure
everything is properly synchronized.

Change-Id: I070d38364e63ab9cf0597fabed3d326ac3685589
Task-number: QTCREATORBUG-13322, QTCREATORBUG-13430
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>