tracker-store: Fixed warning about TrackerSteroidsPrivate
tracker-store: Fixed warning about TrackerSteroidsPrivate

Removed unused private and finalize code

hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker