Fix view name.

Author: MicheleBortol

test/integration/test_index.py

@@ -50,7 +50,7 @@ def test_load_index(self, user1):
         conn = get_connection(user1)
         user_name = conn.getUser().getName()
         django_client = self.new_django_client(user_name, user_name)
-        index_url = reverse("vitessce_index")
+        index_url = reverse("vitessce_tab")
         # asserts we get a 200 response code etc
         rsp = get(django_client, index_url)
         html_str = rsp.content.decode()