Delete outdated disabled test in test_library.py

TemplateTest.album_fields_override_item_values() never ran because of
its name (missing 'test_' prefix). When run it now fails for it targets
outdated functionality.

test/test_library.py

@@ -1067,15 +1067,6 @@ class ImportTimeTest(_common.TestCase):
 
 
 class TemplateTest(_common.LibTestCase):
-    def album_fields_override_item_values(self):
-        self.album = self.lib.add_album([self.i])
-        self.album.albumartist = 'album-level'
-        self.album.store()
-        self.i.albumartist = 'track-level'
-        self.i.store()
-        self.assertEqual(self.i.evaluate_template('$albumartist'),
-                         'album-level')
-
     def test_year_formatted_in_template(self):
         self.i.year = 123
         self.i.store()