BinaryInputBuilder was a bit fucky wucky without the update handler

utils.js

@@ -235,11 +235,13 @@ class BinaryInputBuilder {
 		let input = new ElementBuilder("input#" + this.key)
 			.type("checkbox")
 			.checked(this.result[this.key])
-			.if(this.update_handler !== null, b => b.on_click(e => {
+			.on_click(e => {
 				console.log(e.target.checked);
 				this.result[this.key] = e.target.checked;
+				if(this.update_handler !== null) {
 					this.update_handler(e.target.checked);
-			}))
+				}
+			})
 			.finish();
 
 		let bundle = new ElementBuilder("div.horizontal-list")