lint: Fix a tooling test failure in last commit.

This is what I get for copy-pasting lint rule blocks.

tools/linter_lib/custom_check.py

@@ -492,8 +492,8 @@ def build_custom_checkers(by_lang):
              'puppet/zulip/files/nagios_plugins/zulip_app_frontend/check_send_receive_time',
          ]),
          'description': 'For scripts run as part of installer, cannot rely on typing existing; use `if False` workaround.',
-         'good_lines': ['subprocess.check_call(["ls"])'],
-         'bad_lines': ['subprocess.check_call(["sudo", "ls"])']},
+         'good_lines': ['    from typing import List'],
+         'bad_lines': ['from typing import List']},
         {'pattern': 'django.utils.translation',
          'include_only': set(['test/']),
          'description': 'Test strings should not be tagged for translation',