Update theme.php (#409)

fixed hardcoded root that broke spoilered images on the catalog if vichan was not installed on the web root.

templates/themes/catalog/theme.php

@@ -87,7 +87,7 @@
 							}
 						}
 						else if($files[0]->thumb == 'spoiler') {
-							$post['file'] = '/' . $config['spoiler_image'];
+							$post['file'] = $config['root'] . $config['spoiler_image'];
 						}
 						else {
 							$post['file'] = $config['uri_thumb'] . $files[0]->thumb;