Add PduCount value to userroomid/roomuserid_joined; move PduCount to argument for update_membership.

Signed-off-by: Jason Volk <jason@zemos.net>

src/service/rooms/timeline/append.rs

@@ -363,6 +363,7 @@ where
 						stripped_state,
 						None,
 						true,
+						count,
 					)
 					.await?;
 			}