Properly destroy the blur event handler

The blur event handler is registered as capturing, but the destroy function attempts to remove a non-capturing handler that doesn’t exist.

Author: robinwhittleton

src/js/validate.js

@@ -423,7 +423,7 @@
 if ( !settings ) return;
 
 // Remove event listeners
-document.removeEventListener('blur', blurHandler, false);
+document.removeEventListener('blur', blurHandler, true);
 document.removeEventListener('submit', submitHandler, false);
 
 // Remove all errors