use defined constants

src/job.rs

@@ -245,13 +245,13 @@ impl Job {
                         &mut dest_uid,
                     ) as libc::c_uint
                     {
-                        1 => {
+                        DC_RETRY_LATER => {
                             self.try_again_later(Delay::Standard, None);
                         }
-                        3 => {
+                        DC_SUCCESS => {
                             dc_update_server_uid(context, msg.rfc724_mid, &dest_folder, dest_uid);
                         }
-                        0 | 2 | _ => {}
+                        _ => {}
                     }
                 }
             }