[feature/twig] Remove reference to cachepath, it is not used publicly anymore

PHPBB3-11598

phpBB/includes/style/style.php

@@ -160,8 +160,6 @@ class phpbb_style
 			$this->template->set_style_names($names, $appended_paths);
 		}
 
-		//$this->template->cachepath = $this->phpbb_root_path . 'cache/tpl_' . str_replace('_', '-', $name) . '_';
-
 		return true;
 	}
 

phpBB/includes/template/twig/twig.php

@@ -30,9 +30,12 @@ class phpbb_template_twig implements phpbb_template
 
 	/**
 	* Path of the cache directory for the template
+	*
+	* Cannot be changed during runtime.
+	*
 	* @var string
 	*/
-	public $cachepath = '';
+	private $cachepath = '';
 
 	/**
 	* phpBB root path