libtracker-common: Fix tracker_filename_casecmp_without_extension
libtracker-common: Fix tracker_filename_casecmp_without_extension

This fixes the test case comparing "test.mp3" and "test".

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