Change libraries path to relative (#3433)

app/javascript/packs/public.js

@@ -1,8 +1,8 @@
-import emojify from 'mastodon/emoji';
-import { getLocale } from 'mastodon/locales';
 import { length } from 'stringz';
 import IntlRelativeFormat from 'intl-relativeformat';
 import { delegate } from 'rails-ujs';
+import emojify from '../mastodon/emoji';
+import { getLocale } from '../mastodon/locales';
 import loadPolyfills from '../mastodon/load_polyfills';
 
 require.context('../images/', true);