enable_flat_model now sets vid.creature_scale correctly

hypgraph.cpp

@@ -2547,6 +2547,7 @@ EX void enable_flat_model(int val) {
     vid.human_wall_ratio = .7;
     vid.camera = 1;
     vid.depth = 1;
+    vid.creature_scale = 1;
     geom3::apply_always3();
     check_cgi();
     cgi.require_shapes();