fixup: reset camera_angle to 0 in HUD

hud.cpp

@@ -394,6 +394,7 @@ void drawStats() {
   // vid.alpha = vid.scale = 1;
   dynamicval<ld> va(vid.alpha, 1);
   dynamicval<ld> vs(vid.scale, 1);
+  dynamicval<ld> vc(vid.camera_angle, 0);
 
   calcparam();