Fix hashtags not being picked up when full-width hash sign is used (#36103)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/mastodon/components/autosuggest_input.jsx

@@ -61,7 +61,7 @@ export default class AutosuggestInput extends ImmutablePureComponent {
 
   static defaultProps = {
     autoFocus: true,
-    searchTokens: ['@', ':', '#'],
+    searchTokens: ['@', '＠', ':', '#', '＃'],
   };
 
   state = {