Replace current_theme() and current_theme_url() calls

src/Render/FriendicaSmarty.php

@@ -22,7 +22,7 @@ class FriendicaSmarty extends Smarty
 		parent::__construct();
 
 		$a = get_app();
-		$theme = current_theme();
+		$theme = $a->getCurrentTheme();
 
 		// setTemplateDir can be set to an array, which Smarty will parse in order.
 		// The order is thus very important here

src/Render/FriendicaSmartyEngine.php

@@ -62,7 +62,7 @@ class FriendicaSmartyEngine implements ITemplateEngine
 			$root = $root . '/';
 		}
 
-		$theme = current_theme();
+		$theme = $a->getCurrentTheme();
 		$filename = $template::SMARTY3_TEMPLATE_FOLDER . '/' . $file;
 
 		if (file_exists("{$root}view/theme/$theme/$filename")) {