use save calling syntax

Author: justinallenmarsh

lib/ruby_ui/dialog/dialog_controller.js

@@ -17,9 +17,7 @@ export default class extends Controller {
   }
 
   open(e) {
-    if (e) {
-      e.preventDefault();
-    }
+    e?.preventDefault();
     document.body.insertAdjacentHTML('beforeend', this.contentTarget.innerHTML)
     // prevent scroll on body
     document.body.classList.add('overflow-hidden')