fix compiler warnings - USBD VCP strings resulting in 'condition has identical branches'

[nerdCopter]

fixes:

./src/main/vcp_hal/usbd_desc.c: In function 'USBD_VCP_ConfigStrDescriptor':
./src/main/vcp_hal/usbd_desc.c:262:8: warning: this condition has identical branches [-Wduplicated-branches]
  262 |     if (speed == USBD_SPEED_HIGH) {

./src/main/vcp_hal/usbd_desc.c: In function 'USBD_VCP_InterfaceStrDescriptor':
./src/main/vcp_hal/usbd_desc.c:277:8: warning: this condition has identical branches [-Wduplicated-branches]
  277 |     if (speed == USBD_SPEED_HIGH) {