tracker: do not assume all files in grilo are from our home directory

Summary:
Tracker will soon index files from /home/share as well, just ignore them
for now.

Reviewers: smcv, pwith

Differential Revision: https://phabricator.apertis.org/D398

tracker/automated/test-tracker.py

@@ -113,9 +113,10 @@ class TrackerTest(unittest.TestCase):
 
             url = media.get_url()
             prefix = 'file://' + self.homedir + '/'
-            self.assertTrue(url.startswith(prefix))
-            filename = url[len(prefix):]
+            if not url.startswith(prefix):
+                continue
 
+            filename = url[len(prefix):]
             if filename in ['Music/generic.oga',
                             'Music/generic.mp3',
                             'Music/generic.flac',