Add ale_fix_on_save and ale_fixers to debug output (#731)

* Add ale_fix_on_save and ale_fixers to debug output

* Fix test by adding new ale-fix vars

test/test_ale_info.vader

@@ -19,6 +19,8 @@ Before:
   \  'let g:ale_echo_msg_format = ''%s''',
   \  'let g:ale_echo_msg_warning_str = ''Warning''',
   \  'let g:ale_enabled = 1',
+  \  'let g:ale_fix_on_save = 0',
+  \  'let g:ale_fixers = {}',
   \  'let g:ale_keep_list_window_open = 0',
   \  'let g:ale_lint_delay = 200',
   \  'let g:ale_lint_on_enter = 1',