Fix non-lowercase hashtags not being picked up by the streaming API (#11508)

Regression from f371b32

Fix hashtag links always being lowercase

app/javascript/mastodon/components/status_content.js

@@ -112,7 +112,7 @@ export default class StatusContent extends React.PureComponent {
   }
 
   onHashtagClick = (hashtag, e) => {
-    hashtag = hashtag.replace(/^#/, '').toLowerCase();
+    hashtag = hashtag.replace(/^#/, '');
 
     if (this.context.router && e.button === 0 && !(e.ctrlKey || e.metaKey)) {
       e.preventDefault();