Fixes trypurescript to work with Halogen example (#203)

Mike Solomon · web-flow · commit 2c98ddc7bbca · 2020-12-11T09:02:45.000-08:00
Currently, the affjax example in Halogen does not work and returns the following response:

```
Blocked form submission to '' because the form's frame is sandboxed and the 'allow-forms' permission is not set.
```

Adding the permission fixes the issue.
diff --git a/client/public/index.html b/client/public/index.html
@@ -158,7 +158,7 @@
     }
 
     function setupIFrame($ctr, data) {
-      var $iframe = $('<iframe sandbox="allow-scripts" id="output-iframe" src="frame.html">');
+      var $iframe = $('<iframe sandbox="allow-scripts allow-forms" id="output-iframe" src="frame.html">');
 
       $ctr
         .empty()

Original file line number	Diff line number	Diff line change
`@@ -158,7 +158,7 @@`
`158`	`158`	`}`
`159`	`159`
`160`	`160`	`function setupIFrame($ctr, data) {`
`161`		`- var $iframe = $('<iframe sandbox="allow-scripts" id="output-iframe" src="frame.html">');`
	`161`	`+ var $iframe = $('<iframe sandbox="allow-scripts allow-forms" id="output-iframe" src="frame.html">');`
`162`	`162`
`163`	`163`	`$ctr`
`164`	`164`	`.empty()`