Updated Dummy to take in className prop

• Updated:
- Dummy to take in className prop

app/javascript/gabsocial/components/dummy.js

@@ -1,7 +1,11 @@
 export default class Dummy extends PureComponent {
 
   render() {
-    return <div>{this.props.children}</div>
+    return (
+      <div className={this.props.className}>
+        {this.props.children}
+      </div>
+    )
   }
 
 }