Fix test for clearing response errors when form value changes

In Angular 1.4.x, calling ngModelController.$setViewValue()
does not trigger parsing and validation if the current view
value is the same as the previous view value.

h/static/scripts/directive/test/form-input-test.coffee

@@ -80,7 +80,7 @@ describe 'form-input', ->
 
     assert.include($field.prop('className'), 'form-field-error', 'Fail fast check')
 
-    controller.$setViewValue('abc')
+    controller.$setViewValue('def')
     $scope.$digest()
 
     assert.notInclude($field.prop('className'), 'form-field-error')