Fix various errors, warnings in example config builds (#19686)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

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

 
         #endif
 
-
         static uint8_t buttons = newbutton;
         static uint8_t lastEncoderBits;