fix: correct Waveshare touch pins, banner, test fills

- TOUCH_SDA=17 SCL=18 RST=38 per Waveshare schematic
- GPIO 8/9 conflict with LCD_B0/B3 was blanking the display
- Banner uses BOARD_NAME macro instead of hard-coded E32R35T
- TFT_eSPI #error wrapped in USE_TFT_ESPI guard
- RGB test fills on separate lines so they actually execute

sketches/doorbell-touch-esp32-32e/doorbell-touch-esp32-32e.ino

@@ -21,7 +21,9 @@
 #endif
 #if USE_TFT_ESPI
   #ifndef ST7796_DRIVER
-  #error "TFT_eSPI setup mismatch — ST7796_DRIVER expected for E32R35T"
+  #if USE_TFT_ESPI
+#error "TFT_eSPI setup mismatch — ST7796_DRIVER expected for E32R35T"
+#endif
   #endif
 #endif
 #define HOLD_TO_SILENCE_MS 1000