Fix only typo (#3035)

app/javascript/mastodon/components/autosuggest_textarea.js

@@ -48,7 +48,7 @@ class AutosuggestTextarea extends ImmutablePureComponent {
   };
 
   static defaultProps = {
-    autoFucus: true
+    autoFocus: true
   };
 
   constructor (props, context) {