libtracker-miner: Drop cache on TrackerDecorator pause/resume
libtracker-miner: Drop cache on TrackerDecorator pause/resume

The cached data might be old by the time the miner is resumed, so just
fetch some data from scratch.

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