Changed the default to overcome the changes in:
5018fdac
This commit exposed a bug because the Ender-2 was using a MINIPANEL lcd
and getting default values that were too low, so the text was too weak.
However, the panel should be MKS_MINI_12864, since it
explicitly sets the correct contrast without relying in the defaults.

Co-Authored-By: Msq001 <msq001@users.noreply.github.com>

Fix #14465