[pgsql] Fix SQL for set history limit.

Author: killing

server/repo-mgr.c

@@ -1747,7 +1747,7 @@ seaf_repo_manager_set_repo_history_limit (SeafRepoManager *mgr,
 
         if (exists)
             rc = seaf_db_statement_query (db,
-                                          "UPDATE RepoHistoryLimit SET days=%d "
+                                          "UPDATE RepoHistoryLimit SET days=? "
                                           "WHERE repo_id=?",
                                           2, "int", days, "string", repo_id);
         else