update FLSUN_HISPEED env to flsun_hispeedv1 (#21510)

Marlin/src/pins/pins.h

 #elif MB(FLY_MINI)
   #include "stm32f1/pins_FLY_MINI.h"            // STM32F1                                env:FLY_MINI
 #elif MB(FLSUN_HISPEED)
-  #include "stm32f1/pins_FLSUN_HISPEED.h"       // STM32F1                                env:flsun_hispeed
+  #include "stm32f1/pins_FLSUN_HISPEED.h"       // STM32F1                                env:flsun_hispeedv1
 #elif MB(BEAST)
   #include "stm32f1/pins_BEAST.h"               // STM32F1                                env:STM32F103RE
 #elif MB(MINGDA_MPX_ARM_MINI)