LibJS: Make Script.h not include AST.h

Author: https://github.com/awesomekling
Commit: 65e7c58990
Pull-request: https://github.com/SerenityOS/serenity/pull/16153
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibJS/Runtime/RegExpLegacyStaticProperties.cpp

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/Utf16View.h>
 #include <LibJS/Runtime/RegExpConstructor.h>
 #include <LibJS/Runtime/RegExpLegacyStaticProperties.h>
 #include <LibJS/Runtime/VM.h>