fix civicrmtoken when mosaicoConfig hook is used

[MegaphoneJon]

When using an extension that uses hook_civicrm_mosaicoConfig I would get this error:

Failed to load plugin: civicrmtoken from url https://mysite.org/sites/all/civicrm-custom/extensions/uk.co.vedaconsulting.mosaico/packages/mosaico/dist/rs/plugins/civicrmtoken/plugin.min.js

I thought that tinymceConfigFull was supposed to inherit tinymceConfig - but perhaps that happens differently when the hook is invoked. At any rate, I found that explicitly defining the path to civicrmtoken fixed the issue.