remove MSC4175 timezone on account deactivation

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/admin/user/commands.rs

@@ -165,6 +165,7 @@ pub(super) async fn deactivate(&self, no_leave_rooms: bool, user_id: String) ->
 			.collect();
 		update_displayname(self.services, user_id.clone(), None, all_joined_rooms.clone()).await?;
 		update_avatar_url(self.services, user_id.clone(), None, None, all_joined_rooms).await?;
+		self.services.users.set_timezone(&user_id, None).await?;
 		leave_all_rooms(self.services, &user_id).await;
 	}
 

src/api/client/account.rs

@@ -558,6 +558,9 @@ pub(crate) async fn deactivate_route(
 	// Remove devices and mark account as deactivated
 	services.users.deactivate_account(sender_user)?;
 
+	// Remove timezone profile field
+	services.users.set_timezone(sender_user, None).await?;
+
 	// Remove profile pictures and display name
 	let all_joined_rooms: Vec<OwnedRoomId> = services
 		.rooms