esp32-S3 fix for crash in Bus_Parallel16::release()

has crashed during "delete display"

Author: softhack007

src/platforms/esp32s3/gdma_lcd_parallel16.cpp

@@ -294,6 +294,7 @@
     if (_i80_bus)
     {
       esp_lcd_del_i80_bus(_i80_bus);
+      _i80_bus = nullptr;
     }
     if (_dmadesc_a)
     {

src/platforms/esp32s3/gdma_lcd_parallel16.hpp

@@ -169,7 +169,7 @@
     bool    _double_dma_buffer = false;
     //bool    _dmadesc_a_active   = true;    
 
-    esp_lcd_i80_bus_handle_t _i80_bus;
+    esp_lcd_i80_bus_handle_t _i80_bus = nullptr;
 
 
   };