It sets the crownland as the default, so if you want to change it to something else you just have to give it the line that makes it the default.

autonomy_state = {
id = crownland

is_puppet = yes
*default = yes*
use_overlord_color = yes

min_freedom_level = 0.0
manpower_influence = 1.0

So remove default = yes and put it in any other puppet type.