fix: error where scopeConfig proxy would get $scopeType = default

Author: stijnbernards

src/bitExpert/PHPStan/Magento/Autoload/ProxyAutoloader.php

@@ -111,7 +111,7 @@ protected function getFileContents(string $class): string
                                 break;
                             default:
                                 if (is_string($parameter->getDefaultValue())) {
-                                    $defaultValue = ' = ' . $parameter->getDefaultValue();
+                                    $defaultValue = ' = \'' . $parameter->getDefaultValue() . '\'';
                                 }
                                 break;
                         }