libtracker-miner: Avoid use of TrackerCrawler in TrackerMinerManager
libtracker-miner: Avoid use of TrackerCrawler in TrackerMinerManager

This object just needs it to iterate over .desktop files, so use plain GIO there.

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