test/parse_hwdb: wrap Or inside an And in a Group

test/parse_hwdb: wrap Or inside an And in a Group

I now get a warning like this with python3-pyparsing-3.1.2-8.fc42:

hwdb.d/parse_hwdb.py:208: UserWarning: warn_multiple_tokens_in_named_alternation:
  setting results name 'VALUE' on Or expression will return a list of all parsed
  tokens in an And alternative, in prior versions only the first token was returned;
  enclose contained argument in Group
('!' ^ (Optional('!') - Word(alphanums + '_')))('VALUE')