add no_save to allow testing developer configs

mesh.proto

@@ -613,6 +613,9 @@ message DeviceState {
   /// We keep the last received text message (only) stored in the device flash,
   /// so we can show it on the screen.  Might be null
   MeshPacket rx_text_message = 7;
+
+  /// Used only during development.  Indicates developer is testing and changes should never be saved to flash.
+  bool no_save = 9;
 }
 
 /// Debug output from the device