Exclude URLs from text analysis (mastodon#11759)

By the added regex, URLs, including the one without http or even www
like mysite.com will be removed from the toot's body so only the real
text of the toot will be analyzed for RTL detection

app/javascript/mastodon/rtl.js

@@ -20,6 +20,7 @@ export function isRtl(text) {
  text = text.replace(/(?:^|[^\/\w])@([a-z0-9_]+(@[a-z0-9\.\-]+)?)/ig, '');
  text = text.replace(/(?:^|[^\/\w])#([\S]+)/ig, '');
  text = text.replace(/\s+/g, '');
+ text = text.replace(/(\w\S+\.\w{2,}\S*)/g, '');
 
  const matches = text.match(rtlChars);