Enable UART3 TX.

Author: ghent360

Diff for: variants/PRNTR_F407_V1/PeripheralPins.c

@@ -190,7 +190,7 @@ WEAK const PinMap PinMap_UART_TX[] = {
   //  {PC_10, USART3,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)}, // SDIO
   //  {PC_12, UART5,   STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF8_UART5)},  // I2S3_SD
   {PD_5,  USART2,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART2)},   // USB
-  //  {PD_8,  USART3,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)}, // Z_END
+  {PD_8,  USART3,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)}, // Z_END
   {NC,    NP,    0}
 };
 #endif