Count all URLs in text as 23 characters flat, do not count domain part of usernames (#4427)

* Count all URLs in text as 23 characters flat, do not count domain part of usernames

* Add new status text counting logic to web UI

app/javascript/mastodon/features/compose/components/character_counter.js

@@ -13,12 +13,12 @@ export default class CharacterCounter extends React.PureComponent {
     if (diff < 0) {
       return <span className='character-counter character-counter--over'>{diff}</span>;
     }
+
     return <span className='character-counter'>{diff}</span>;
   }
 
   render () {
     const diff = this.props.max - length(this.props.text);
-
     return this.checkRemainingText(diff);
   }