ResizeBuffers re-derived the swapchain height from the runtime's recommended aspect instead of
taking the launcher's pick -- a 2560x2848 selection came out as 2560x2682. Both it and
ResizeBuffers1 now use the launcher size verbatim.
xr_dlss_res_override and xr_dlss_matrix_hook are deleted, along with xr_dlss_slot_mode and
xr_dlss_log_stride which only fed them. 553 lines; both were AER-era and shipped off.