dialog_list dialog buttons are still off-center

Steps to reproduce:

• Start a world with commands enabled

• Run the following command:

  /dialog show @s {type:"minecraft:dialog_list",title:"Test",columns:1,button_width:500,dialogs:[{type:"minecraft:notice",title:"",external_title:"Dialog 1"},{type:"minecraft:notice",title:"",external_title:"Dialog 2"}]}

Observed results:

• The buttons are not centered (slightly to the right)

Expected results:

• The buttons are centered