do not use DIRECTORY_SEPARATOR in error messages

Fixes #406

Author: mglaman

src/Rules/Drupal/LoadIncludes.php

@@ -70,7 +70,7 @@ public function processNode(Node $node, Scope $scope): array
             return [
                 RuleErrorBuilder::message(sprintf(
                     'File %s could not be loaded from %s::loadInclude',
-                    $module->getPath() . DIRECTORY_SEPARATOR . $filename,
+                    $module->getPath() . '/' . $filename,
                     ModuleHandlerInterface::class
                 ))
                     ->line($node->getLine())

src/Rules/Drupal/ModuleLoadInclude.php

@@ -58,7 +58,7 @@ public function processNode(Node $node, Scope $scope): array
             return [
                 RuleErrorBuilder::message(sprintf(
                     'File %s could not be loaded from module_load_include.',
-                    $module->getPath() . DIRECTORY_SEPARATOR . $filename
+                    $module->getPath() . '/' . $filename
                 ))
                     ->line($node->getLine())
                     ->build()