[TASK] Drop the configuration check for the currency (#4272)

This is another blocker for getting rid of the
`static_info_tables` dependency.

Author: oliverklee

Classes/Configuration/SharedConfigurationCheck.php

@@ -5,8 +5,6 @@
 namespace OliverKlee\Seminars\Configuration;
 
 use OliverKlee\Oelib\Configuration\AbstractConfigurationCheck;
-use TYPO3\CMS\Core\Database\ConnectionPool;
-use TYPO3\CMS\Core\Utility\GeneralUtility;
 
 /**
  * Configuration check for all settings in `plugin.tx_seminars`.
@@ -17,7 +15,6 @@ class SharedConfigurationCheck extends AbstractConfigurationCheck
 {
     protected function checkAllConfigurationValues(): void
     {
-        $this->checkCurrency();
         $this->checkGeneralPriceInMail();
         $this->checkRegistrationFlag();
         $this->checkSalutationMode();
@@ -32,22 +29,6 @@ protected function checkAllConfigurationValues(): void
         }
     }
 
-    /**
-     * Checks whether `plugin.tx_seminars.currency` is not empty and a valid ISO 4217 alpha 3.
-     */
-    private function checkCurrency(): void
-    {
-        $connection = GeneralUtility::makeInstance(ConnectionPool::class)->getConnectionForTable('static_currencies');
-        $result = $connection->select(['cu_iso_3'], 'static_currencies')->fetchAllAssociative();
-        $allowedValues = \array_column($result, 'cu_iso_3');
-
-        $this->checkIfSingleInSetNotEmpty(
-            'currency',
-            'The specified currency setting is either empty or not a valid ISO 4217 alpha 3 code.',
-            $allowedValues
-        );
-    }
-
     private function checkGeneralPriceInMail(): void
     {
         $this->checkIfBoolean(

phpstan-baseline.neon

@@ -115,11 +115,6 @@ parameters:
 			count: 1
 			path: Classes/Configuration/EventRegistrationFlexForms.php
 
-		-
-			message: "#^Parameter \\#3 \\$allowedValues of method OliverKlee\\\\Oelib\\\\Configuration\\\\AbstractConfigurationCheck\\:\\:checkIfSingleInSetNotEmpty\\(\\) expects array\\<string\\>, array\\<int, mixed\\> given\\.$#"
-			count: 1
-			path: Classes/Configuration/SharedConfigurationCheck.php
-
 		-
 			message: "#^Provide more specific return type \"OliverKlee\\\\Seminars\\\\Csv\\\\CsvResponse\" over abstract one$#"
 			count: 1