libtracker-data: Use update buffer for deletes as well
libtracker-data: Use update buffer for deletes as well

This fixes handling of FTS updates when deleting or updating property
values by reusing the logic written for inserts.

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