increase SMP queue ID and message ID size to 24 bytes

src/Simplex/Messaging/Server/Env/STM.hs

@@ -27,7 +27,7 @@ data ServerConfig = ServerConfig
     tbqSize :: Natural,
     msgQueueQuota :: Natural,
     queueIdBytes :: Int,
-    msgIdBytes :: Int,
+    msgIdBytes :: Int, -- must be at least 24 bytes, it is used as 192-bit nonce for XSalsa20
     storeLog :: Maybe (StoreLog 'ReadMode),
     blockSize :: Int,
     trnSignAlg :: C.SignAlg,