LibWeb: Remove Document::is_scripting_enabled() and use Node's

There's no need to have a custom is_scripting_enabled() for the
Document class, as it (indirectly) inherits from Node.
Also, let's not hardcode false here :^)

Userland/Libraries/LibWeb/DOM/Document.h

@@ -70,8 +70,6 @@ public:
     Origin origin() const;
     void set_origin(const Origin& origin);
 
-    bool is_scripting_enabled() const { return true; }
-
     AK::URL parse_url(String const&) const;
 
     CSS::StyleComputer& style_computer() { return *m_style_computer; }

Userland/Libraries/LibWeb/DOM/Node.cpp

@@ -843,11 +843,19 @@ void Node::serialize_tree_as_json(JsonObjectSerializer<StringBuilder>& object) c
     }
 }
 
+// https://html.spec.whatwg.org/multipage/webappapis.html#concept-n-script
+bool Node::is_scripting_enabled() const
+{
+    // Scripting is enabled for a node node if node's node document's browsing context is non-null, and scripting is enabled for node's relevant settings object.
+    // FIXME: Check if scripting is enabled for the ESO.
+    return document().browsing_context();
+}
+
 // https://html.spec.whatwg.org/multipage/webappapis.html#concept-n-noscript
 bool Node::is_scripting_disabled() const
 {
-    // FIXME: or when scripting is disabled for its relevant settings object.
-    return !document().browsing_context();
+    // Scripting is disabled for a node when scripting is not enabled, i.e., when its node document's browsing context is null or when scripting is disabled for its relevant settings object.
+    return !is_scripting_enabled();
 }
 
 // https://dom.spec.whatwg.org/#dom-node-contains

Userland/Libraries/LibWeb/DOM/Node.h

@@ -188,6 +188,7 @@ public:
 
     bool is_host_including_inclusive_ancestor_of(const Node&) const;
 
+    bool is_scripting_enabled() const;
     bool is_scripting_disabled() const;
 
     bool contains(RefPtr<Node>) const;