fix ls_sleeps communication to device clients

src/plugins/AdminPlugin.cpp

@@ -24,6 +24,12 @@ void AdminPlugin::handleGetRadio(const MeshPacket &req)
         // We create the reply here
         AdminMessage r = AdminMessage_init_default;
         r.get_radio_response = devicestate.radio;
+
+        // NOTE: The phone app needs to know the ls_secs value so it can properly expect sleep behavior.
+        // So even if we internally use 0 to represent 'use default' we still need to send the value we are
+        // using to the app (so that even old phone apps work with new device loads).
+        r.get_radio_response.preferences.ls_secs = getPref_ls_secs();
+
         r.which_variant = AdminMessage_get_radio_response_tag;
         reply = allocDataProtobuf(r);
     }