libtracker-miner: Cancel writeback when the file is deleted/moved
libtracker-miner: Cancel writeback when the file is deleted/moved

In these situations, writeback is no longer reliable, and prone to
leave an unwanted copy of the file, so cancel writeback if the file
is being manipulated that way externally to tracker.

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