Use the correct property names in the up and forward axis update callbacks. Otherwise they don't work as intended and the following will be traced to the console: ``` RNA_enum_get: WM_OT_usd_export.forward_axis not found. RNA_enum_get: WM_OT_usd_export.up_axis not found. ``` Pull Request: https://projects.blender.org/blender/blender/pulls/124112