libtracker-miner: Add back the code removing thumbnail/albumart
libtracker-miner: Add back the code removing thumbnail/albumart

The mimetype isn't needed there after all.

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