Update display timing defaults for AVR boards#21518

thinkyhead merged 1 commit intoMarlinFirmware:bugfix-2.0.xMarlinFirmware/Marlin:bugfix-2.0.xfrom

XDA-Bam:bugfix-2.0.x-LCD_timing_fix2XDA-Bam/Marlin:bugfix-2.0.x-LCD_timing_fix2Copy head branch name to clipboard