Bug 1098587 - Reporting: Renaming rooms

Code for renaming rooms. Every time we send a Telemetry report, we include the number of times every room on the device, at that moment, has been renamed.
I needed to add a function to reset a telemetry report entry to [] or 0, because I need to clear 'roomRenamingCount' to [] everytime a report is sent. I don't want to send the history from the begining of times the user started to use rooms on its phone.