tests: remove useless register_uri() from test_edit_variant

The edit_variant() method does not make any GET requests, so we do not
need to register a fake GET response. (This was likely a bad
copy-and-paste from another test.)

tests/test_errata_tool_variant.py

@@ -58,10 +58,6 @@ def test_create_variant(self, client, params):
         assert history[0].json() == expected
 
     def test_edit_variant(self, client, params):
-        client.adapter.register_uri(
-            'GET',
-            PROD + '/api/v1/variants?filter%5Bname%5D=8Base-RHCEPH-4.0-Tools',
-            json=ceph_tools_variant_json_response())
         client.adapter.register_uri(
             'PUT',
             PROD + '/api/v1/variants/2341')