Add BRIDGE_DEBUG flag

variants/heltec_v4/platformio.ini

@@ -77,6 +77,7 @@ build_flags =
   -D ADMIN_PASSWORD='"password"'
   -D MAX_NEIGHBOURS=8
   -D WITH_ESPNOW_BRIDGE=1
+;  -D BRIDGE_DEBUG=1
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
 build_src_filter = ${Heltec_lora32_v4.build_src_filter}