🐛 Fix Creality v4 servo timer (#22021)

Followup to #21999

ini/stm32f1.ini

@@ -148,7 +148,7 @@ lib_deps             =
 [env:STM32F103RET6_creality]
 platform             = ${common_stm32.platform}
 extends              = common_stm32
-build_flags          = ${common_stm32.build_flags} -DMCU_STM32F103RE -DHAL_SD_MODULE_ENABLED -DSS_TIMER=4 -DENABLE_HWSERIAL3 -DTRANSFER_CLOCK_DIV=8
+build_flags          = ${common_stm32.build_flags} -DMCU_STM32F103RE -DHAL_SD_MODULE_ENABLED -DSS_TIMER=4 -DTIMER_SERVO=TIM5 -DENABLE_HWSERIAL3 -DTRANSFER_CLOCK_DIV=8
 board                = genericSTM32F103RE
 monitor_speed        = 115200
 board_build.core     = stm32