Fix newlines not being considered sentence separators in account note (#16079)

Also bullets

app/javascript/mastodon/features/follow_recommendations/components/account.js

@@ -27,7 +27,7 @@ const makeMapStateToProps = () => {
 };
 
 const getFirstSentence = str => {
-  const arr = str.split(/(([\.\?!]+\s)|[．。？！])/);
+  const arr = str.split(/(([\.\?!]+\s)|[．。？！\n•])/);
 
   return arr[0];
 };