events: remove eventtarget custom inspect branding

Author: efekrskl

lib/internal/event_target.js

@@ -867,8 +867,6 @@ class EventTarget {
     return new CustomEvent(type, { detail: nodeValue });
   }
   [customInspectSymbol](depth, options) {
-    if (!isEventTarget(this))
-      throw new ERR_INVALID_THIS('EventTarget');
     const name = this.constructor.name;
     if (depth < 0)
       return name;