don't arbitrarily limit UIDs to a billion, part 2

imap_find_new_msgs() had the same fixed limit as imap_load_box().

amends 815822d8.

src/drv_imap.c

@@ -2637,7 +2637,7 @@ imap_find_new_msgs_p2( imap_store_t *ctx, struct imap_cmd *gcmd, int response )
 	}
 	INIT_IMAP_CMD(imap_cmd_simple, cmd, cmdp->gen.callback, cmdp->gen.callback_aux)
 	imap_exec( (imap_store_t *)ctx, &cmd->gen, imap_done_simple_box,
-	           "UID FETCH %d:1000000000 (UID BODY.PEEK[HEADER.FIELDS (X-TUID)])", cmdp->uid );
+	           "UID FETCH %d:" stringify(INT_MAX) " (UID BODY.PEEK[HEADER.FIELDS (X-TUID)])", cmdp->uid );
 }
 
 /******************* imap_list_store *******************/