message: [build] fix the condition of enabling Border Routing counters
  Fix an issue that Border Routing counters is not available when
  `OTBR_BORDER_ROUTING` is off but `OTBR_BACKBONE_ROUTER` is on.
diff: @@ -43,7 +43,7 @@ endif()
  option(OTBR_BORDER_ROUTING "Enable Border Routing Manager" OFF)
  option(OTBR_BORDER_ROUTING_COUNTERS "Enable Border Routing Counters" ON)
  -if (OTBR_BORDER_ROUTING AND OTBR_BORDER_ROUTING_COUNTERS)
  +if (OTBR_BORDER_ROUTING_COUNTERS)
  target_compile_definitions(otbr-config INTERFACE OTBR_ENABLE_BORDER_ROUTING_COUNTERS=1)
  endif()
  