libtracker-data: Remove duplicated version of tracker_db_manager_init_locations()
libtracker-data: Remove duplicated version of tracker_db_manager_init_locations()

The return value of g_get_user_data_dir() and friends is constant
through the lifecycle of the process, so there's no need to initialise
paths more than once or in different ways.

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