Tweak a unit test to improve coverage

Now both branches of the self._url.endswith conditional block from the
last commit are covered: test_check_url_same now covers the branch where
the URL does *not* already end with '/', and test_repo_dir_synced
appears to still cover the branch where the URL *does* already end with
'/' (based on seeing that that unit test still fails if that branch is
wrong).

test/test_unit_repository_svn.py

@@ -60,7 +60,7 @@ def setUp(self):
         self._name = 'component'
         rdata = {ExternalsDescription.PROTOCOL: 'svn',
                  ExternalsDescription.REPO_URL:
-                     'https://svn-ccsm-models.cgd.ucar.edu/',
+                     'https://svn-ccsm-models.cgd.ucar.edu',
                  ExternalsDescription.TAG:
                      'mosart/trunk_tags/mosart1_0_26',
                  }