test(desktop): send account sites from the source-connect stub

#9762 made sites a required field of a viewer account, so the stub's account failed the
response contract and the count never reached 1.

Author: waleedlatif1

apps/desktop/e2e/source-connect.spec.ts

@@ -117,6 +117,7 @@ test('source authorization returns to its desktop screen and refreshes live', as
                 groupId: 'fixture-group',
                 optionId: 'fixture-option',
                 status: 'active',
+                sites: [],
               },
             ]
           : [],