LibJS: Move the current exception from Interpreter to VM

This will allow us to throw exceptions even when there is no active
interpreter in the VM.

Libraries/LibWeb/DOM/Document.cpp

@@ -434,7 +434,7 @@ JS::Value Document::run_javascript(const StringView& source)
     auto& interpreter = document().interpreter();
     auto result = interpreter.run(interpreter.global_object(), *program);
     if (interpreter.exception())
-        interpreter.clear_exception();
+        interpreter.vm().clear_exception();
     return result;
 }