TrackerMinerFS: Fix escaping in some SparQL queries.
TrackerMinerFS: Fix escaping in some SparQL queries.

Using single quotes is prone to escaping errors if the string
contains single quotes as well.

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