Fix pushMessage parameter encoding

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

src/clients/mycelium_client.rs

@@ -125,16 +125,15 @@ impl MyceliumClient {
             Destination::Ip(ip) => json!({ "ip": ip.to_string() }),
             Destination::Pk(pk) => json!({ "pk": pk }),
         };
-        let message = json!({
+        let mut message = json!({
             "dst": dst_v,
             "topic": topic,
             "payload": payload_b64,
         });
-        let mut params = json!({ "message": message });
         if let Some(rt) = reply_timeout {
-            params["reply_timeout"] = json!(rt);
+            message["reply_timeout"] = json!(rt);
         }
-        params
+        message
     }
 
     /// pushMessage: send a message with dst/topic/payload. Optional reply_timeout for sync replies.