Can't disable pre_z

目前在 graphic_settings.ant 里面关闭 pre_z 会报错： ``` graphic: disable_pre_z:true ``` ``` [2024-08-24 23:32:54.36][ERROR]( ant.window|window ) attempt to index a nil value (local 'dq') stack traceback: ( service:7 ) C:/project/ant/pkg/ant.render/preprocess/ssao.lua:219: in upvalue 'update_ao_frame_properties' C:/project/ant/pkg/ant.render/preprocess/ssao.lua:283: in local 'f' C:/project/ant/pkg/ant.world/main.lua:477: in field '_pipeline_update' C:/project/ant/pkg/ant.world/main.lua:589: in method 'pipeline_update' C:/project/ant/pkg/ant.window/service/window.lua:81: in upvalue 'f' ``` @junjie020 记得查一下这个问题。