[fix] Fixed failing of indoor location test in openwisp-controller

Fixed a failing indoor location test in the 'geo' app of openwisp-controller
by modifying the filter_url to consider the app_label during execution.
Previously, the test 'test_floorplan_add_view_filters_indoor_location'
was failing due to a hardcoded filter_url.

django_loci/tests/base/test_admin.py

@@ -7,6 +7,7 @@
 
 
 class BaseTestAdmin(TestAdminMixin, TestLociMixin):
+    app_label = 'django_loci'
     geocode_url = 'https://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer/'
 
     def test_location_list(self):
@@ -86,7 +87,9 @@ def test_floorplan_add_view_filters_indoor_location(self):
             name='test-admin-outdoor-location', type='outdoor'
         )
         url = reverse('{0}_floorplan_add'.format(self.url_prefix))
-        filter_url = '/admin/django_loci/location/?_to_field=id&type__exact=indoor'
+        filter_url = (
+            f'/admin/{self.app_label}/location/?_to_field=id&type__exact=indoor'
+        )
         r1 = self.client.get(url)
         self.assertContains(
             r1,