Adjust dca files and callbacks to work with toolkit v2.

module/dca/tl_module.php

@@ -70,7 +70,7 @@ $GLOBALS['TL_DCA']['tl_module']['fields']['leaflet_template'] = array(
     'label'            => &$GLOBALS['TL_LANG']['tl_module']['leaflet_template'],
     'inputType'        => 'select',
     'exclude'          => true,
-    'options_callback' => \Netzmacht\Contao\Toolkit\Dca::createGetTemplatesCallback('leaflet_map_js'),
+    'options_callback' => \Netzmacht\Contao\Toolkit\Dca\Callback\CallbackFactory::getTemplates('leaflet_map_js'),
     'eval'             => array(
         'tl_class' => 'w50',
         'chosen'   => true,