Use FormHelper::input() inside FormHelper::controls()

This ensures that if FormHelper::input() is overridden in a child class
customizations done in that are not lost.

src/View/Helper/FormHelper.php

@@ -953,7 +953,7 @@ public function controls(array $fields, array $options = [])
                 continue;
             }
 
-            $out .= $this->control($name, (array)$opts);
+            $out .= $this->input($name, (array)$opts);
         }
 
         return $this->fieldset($out, $options);