Add missing TCA config

public/typo3conf/ext/ep_products/Configuration/TCA/tx_epproducts_domain_model_date.php

@@ -23,8 +23,8 @@ return [
         'iconfile' => 'EXT:ep_theme/Resources/Public/images/icon_ce.svg',
     ],
     'types' => [
-        '1' => ['showitem' => 'hidden, bus_pro_id, hotel_bus_pro_id, code, daytrip, date_start, date_end, nights, board, 
-            board_code, board_bus_pro_id, bus_included, bus_available, skipass_included, services_included, 
+        '1' => ['showitem' => 'hidden, bus_pro_id, hotel_bus_pro_id, code, daytrip, date_start, date_end, nights, board,
+            board_code, board_bus_pro_id, bus_included, bus_available, skipass_included, services_included,
             services_general, pickups, discount, min_price, pseudo_price, available'],
     ],
     'palettes' => [
@@ -150,6 +150,7 @@ return [
             'label' => 'Saison',
             'config' => [
                 'type' => 'select',
+                'renderType' => 'selectSingle',
                 'items' => [
                     [ 'Winter', 'w' ],
                     [ 'Sommer', 's' ],