Normalize nonceVerificationFunctions instead of customNonceVerificationFunctions

Author: rodrigoprimo

WordPress/Sniffs/Security/NonceVerificationSniff.php

@@ -413,13 +413,13 @@ private function set_cache( $filename, $start, $end, $nonce ) {
 	 */
 	protected function mergeFunctionLists() {
 		if ( $this->customNonceVerificationFunctions !== $this->addedCustomNonceFunctions ) {
-			$this->customNonceVerificationFunctions = array_map( 'strtolower', $this->customNonceVerificationFunctions );
-
 			$this->nonceVerificationFunctions = RulesetPropertyHelper::merge_custom_array(
 				$this->customNonceVerificationFunctions,
 				$this->nonceVerificationFunctions
 			);
 
+			$this->nonceVerificationFunctions = array_change_key_case( $this->nonceVerificationFunctions );
+
 			$this->addedCustomNonceFunctions = $this->customNonceVerificationFunctions;
 		}
 	}