Bug 1100921: add default camera used to telemetry reports

Added default camera used in loop in Telemetry reports.
It isn't still working.
When you received a call frontCamera is a boolean value and when you make a call it's a string value.
therefore, when you make a call _defaultCamera will have the correct value but when you'll receive a call it's always going to have 'rear' value because when you compare a boolean with a string the boolean value will be converted to 1 or 0 and it try to compare again