FTE: Set sv_nopvs to 1 to hold onto client data at all times

pc/nzp/fte.cfg

@@ -341,6 +341,7 @@ vid_srgb "1"            //-1: Only the framebuffer should use sRGB colourspace,
                         //Note that driver behaviour varies by a disturbing amount, and much of the documentation conflicts with itself (the term 'linear' is awkward when the eye's perception of linear is non-linear).
 vid_multisample "0"     //The number of samples to use for Multisample AntiAliasing (aka: msaa). A value of 1 explicitly disables it.
 r_novis "1"
+sv_nopvs "1"
 
 // Graphical Nicaties
 gl_overbright_all "0"