Issue #3156070 by Hardik_Patel_12, kiamlaluno: Unused local variables from ConfigSchemaTest file

(cherry picked from commit 700b1c92)

core/tests/Drupal/KernelTests/Core/Config/ConfigSchemaTest.php

@@ -228,7 +228,6 @@ public function testSchemaMapping() {
 
     $this->assertEqual($definition, $expected, 'Retrieved the right metadata for the first effect of image.style.medium');
 
-    $a = \Drupal::config('config_test.dynamic.third_party');
     $test = \Drupal::service('config.typed')->get('config_test.dynamic.third_party')->get('third_party_settings.config_schema_test');
     $definition = $test->getDataDefinition()->toArray();
     $expected = [];