chore(ui): Move an inline comment.

This patch moves an inline comment in its correct place. Code
was inserted between the comment and the part of the code it was
documenting.

Author: Hywan

crates/matrix-sdk-ui/src/timeline/builder.rs

@@ -246,9 +246,6 @@ impl TimelineBuilder {
             })
         };
 
-        // Not using room.add_event_handler here because RoomKey events are
-        // to-device events that are not received in the context of a room.
-
         let room_key_handle = client.add_event_handler(handle_room_key_event(
             controller.clone(),
             room.room_id().to_owned(),
@@ -261,6 +258,9 @@ impl TimelineBuilder {
 
         let handles = vec![room_key_handle, forwarded_room_key_handle];
 
+        // Not using room.add_event_handler here because RoomKey events are
+        // to-device events that are not received in the context of a room.
+
         let room_key_from_backups_join_handle = spawn(room_keys_from_backups_task(
             client.encryption().backups().room_keys_for_room_stream(controller.room().room_id()),
             controller.clone(),