libtracker-extract: Read FallbackRdfTypes as a string list in .rule files
libtracker-extract: Read FallbackRdfTypes as a string list in .rule files

FallbackRdfTypes (with an extra 's') is now a string list, so all rdf:types
that apply to a mimetype can be specified.

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