Modules: fixed stack attach for native fetch exceptions for qjs.

Modules: fixed stack attach for native fetch exceptions for qjs.

JS_ThrowInternalError() captures backtrace outside of JS call, resulting
in empty "stack" string.  Later, while unwinding, is_backtrace_needed()
returns false because "stack" property exists.

JS_NewError() does not try to attach stack, as a result a stack is
attached later during unwinding.