Fixing private docs in active slot. Regression from #615.

Author: Bill Hunt

app/models/Doc.php

@@ -358,7 +358,8 @@ public static function getActive($num, $offset)
                         GROUP BY doc_id
 
                 ) total_count
-                WHERE private != 1
+                LEFT JOIN docs on doc_id = docs.id
+                WHERE docs.private != 1
                 GROUP BY doc_id
                 ORDER BY total DESC
                 LIMIT :offset, :limit"