phpunit: fix unit tests

Signed-off-by: Raul Ferreira Fuentes <r.ferreira.fuentes+fs@gmail.com>
Signed-off-by: Raul Ferreira Fuentes <r.ferreira.fuentes@gmail.com>

Author: Raudius

.php_cs.dist .php_cs-fixer.dist.php_cs.dist renamed to .php_cs-fixer.dist

@@ -4,11 +4,11 @@
 use OCP\ITempManager;
 
 class TestTempManager implements ITempManager {
-	public function getTemporaryFile($postFix = '') {
+	public function getTemporaryFile(string $postFix = ''): string {
 		return 'temp_file' . $postFix;
 	}
 
-	public function getTemporaryFolder($postFix = '') {
+	public function getTemporaryFolder(string $postFix = ''): string {
 		return sys_get_temp_dir();
 	}