Fix syntax in test_add_account

src/sakia/tests/functional/process_cfg_account/test_add_account.py

@@ -86,7 +86,7 @@ class ProcessAddCommunity(unittest.TestCase, QuamashTest):
             self.assertEqual(self.application.current_account.name, "test")
             self.assertEqual(self.application.preferences['account'], "test")
             self.assertEqual(len(self.application.current_account.wallets), 1)
-            yield from asyncio.sleep(0)
+            await asyncio.sleep(0)
 
         self.lp.call_later(10, close_dialog)
         asyncio.ensure_future(exec_test())