add script dataurl test

Author: karlseguin

src/tests/html/script/script.html

@@ -17,3 +17,5 @@
   script.nonce = 'hello';
   testing.expectEqual('hello', script.nonce);
 </script>
+
+<script id=datauri src="data:text/plain;charset=utf-8;base64,dGVzdGluZy5leHBlY3RFcXVhbCh0cnVlLCB0cnVlKTs="></script>