Blur currentTarget instead of target

This probably fixes this issue which is still unresolved:
angular/angular.js#6432

Not sure if this patch breaks something else, but we're using
ui-bootstrap modals, and otherwise we wouldn't be able to focus
on inputs in such modals.

Author: pomerantsev

angular-touch.js

@@ -351,7 +351,7 @@ ngTouch.directive('ngClick', ['$parse', '$timeout', '$rootElement',
     event.preventDefault();
 
     // Blur focused form elements
-    event.target && event.target.blur();
+    event.currentTarget && event.currentTarget.blur();
   }