🐛 Fix SPI DMA and default mode (#23627)

Followup to #23464

Marlin/src/lcd/extui/mks_ui/tft_lvgl_configuration.cpp

   uint16_t width = area->x2 - area->x1 + 1,
           height = area->y2 - area->y1 + 1;
 
-  TERN_(USE_SPI_DMA_TC, disp_drv_p = disp);
+  disp_drv_p = disp;
 
   SPI_TFT.setWindow((uint16_t)area->x1, (uint16_t)area->y1, width, height);
 

Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V3_common.h

 #endif // HAS_WIRED_LCD
 
 #if HAS_TFT_LVGL_UI
-  #define USE_SPI_DMA_TC
+  // Enable SPI DMA, this requires button pins, thus no buttons. Default is DISABLED.
+  //#define USE_SPI_DMA_TC
 #endif
 
 #if ANY(TFT_COLOR_UI, TFT_LVGL_UI, TFT_CLASSIC_UI, HAS_WIRED_LCD)