tests: update for Thunderbird version/config in Whonix 17

Author: marmarek

tests/test_thunderbird.py

@@ -277,7 +277,7 @@ def get_messages(tb):
         except tree.SearchError:
             # TB < 128
             tb.app.button('Get Messages').doActionNamed('press')
-        tb.app.child(name='Inbox.*', roleName='tree item').doActionNamed(
+        tb.app.child(name='Inbox.*|user@localhost', roleName='tree item').doActionNamed(
             'activate')
     except tree.SearchError:
         # TB < 115