Bug fix: Modify quote to double quote.

To test, replace in www/index.html:
- l.407 by
```JavaScript
var params = { color: "fewo\"i#eprw'jew–\wqrq\njterpwo" };
```
- l.421 by
```JavaScript
alert(e.data.message);
```
and in www/assets/canvas/index.js:
- l.82 by:
```JavaScript
wizCanvasMessenger.postMessage({ message: e.data.color }, "mainView");
```