ref: 6d916b0985f31acc22b98bb53a42086c63367baa
parent: 4ccf8bb9ef7dcfda6d7e0ab172df2dbdae74110c
author: Sigrid Solveig Haflínudóttir <sigrid@ftrv.se>
date: Sun Dec 31 15:12:03 EST 2023
D_DrawSurfaces: fix wrong flag used to draw (or not) zspans