libtracker-miner: Remove operations on children on deleted folders
libtracker-miner: Remove operations on children on deleted folders

This is an optimization to reduce the number of queries that we
perform across the deletion of large directory trees.

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