use wrapped database execute function

git-svn-id: file:///home/shish/svn/shimmie2/trunk@129 7f39781d-f577-437e-ae19-be835c7a54ca

core/ext/image.ext.php

@@ -157,7 +157,7 @@ class ImageIO extends Extension {
 		}
 
 		// actually insert the info
-		$database->db->Execute(
+		$database->Execute(
 				"INSERT INTO images(owner_id, owner_ip, filename, filesize, hash, ext, width, height, posted) ".
 				"VALUES (?, ?, ?, ?, ?, ?, ?, ?, now())",
 				array($user->id, $_SERVER['REMOTE_ADDR'], $image->filename, $image->filesize,