Enable conversions on test files by default

```
coder_upgrade_conversions_form_defaults()
...
  $extensions = array(
    'inc' => TRUE,
    'info' => TRUE,
    'install' => TRUE,
    'module' => TRUE,
    'js' => TRUE,
//    'php' => FALSE,
//    'profile' => FALSE,
//    'test' => FALSE,
//    'theme' => FALSE,
  );
...
```

