Merge branch 'nyaaori/fix-otk-reporting' into 'next'

Always send device_one_time_keys_count when not zero, fixing #178

Closes #169 and #178

See merge request famedly/conduit!213

src/client_server/sync.rs

@@ -755,13 +755,7 @@ async fn sync_helper(
             changed: device_list_updates.into_iter().collect(),
             left: device_list_left.into_iter().collect(),
         },
-        device_one_time_keys_count: if db.users.last_one_time_keys_update(&sender_user)? > since
+        device_one_time_keys_count: db.users.count_one_time_keys(&sender_user, &sender_device)?,
-            || since == 0
-        {
-            db.users.count_one_time_keys(&sender_user, &sender_device)?
-        } else {
-            BTreeMap::new()
-        },
         to_device: sync_events::ToDevice {
             events: db
                 .users