Fixed reset bug

[JBriggs666]

When resetting a form with a trTrustpass input by resetting model, using a function like:

var defaultModel = {
  password : ''
};

vm.reset = function () {
  myModel = angular.copy(defaultModel);
  $scope.form.$setPristine();
  $scope.form.$setUntouched();
};

then the form becomes pristine but the input remains dirty, and if model is reset to an empty string, the input does not update to it's original state. This is now fixed.