Support optional device_id's in lazy-loading context.

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

src/api/client/context.rs

@@ -113,7 +113,7 @@ pub(crate) async fn get_context_route(
 
 	let lazy_loading_context = lazy_loading::Context {
 		user_id: sender_user,
-		device_id: sender_device,
+		device_id: Some(sender_device),
 		room_id,
 		token: Some(base_count.into_unsigned()),
 		options: Some(&filter.lazy_load_options),

src/api/client/message.rs

@@ -132,7 +132,7 @@ pub(crate) async fn get_message_events_route(
 
 	let lazy_loading_context = lazy_loading::Context {
 		user_id: sender_user,
-		device_id: sender_device,
+		device_id: Some(sender_device),
 		room_id,
 		token: Some(from.into_unsigned()),
 		options: Some(&filter.lazy_load_options),

src/api/client/sync/v3.rs

@@ -651,7 +651,7 @@ async fn load_joined_room(
 
 	let lazy_loading_context = &lazy_loading::Context {
 		user_id: sender_user,
-		device_id: sender_device,
+		device_id: Some(sender_device),
 		room_id,
 		token: Some(since),
 		options: Some(&filter.room.state.lazy_load_options),