Fix - don't allow dead body of player to climb on the ladder

It was visible probably only locally.

source/src/physics.cpp

@@ -434,7 +434,7 @@ void moveplayer(physent *pl, int moveres, bool local, int curtime)
                     const float climbspeed = 1.0f;
 
                     if(pl->type==ENT_BOT && pl->state == CS_ALIVE) pl->vel.z = climbspeed; // bots climb upwards only
-                    else if(pl->type==ENT_PLAYER)
+                    else if(pl->type==ENT_PLAYER && pl->state == CS_ALIVE)
                     {
                         if(((playerent *)pl)->k_up) pl->vel.z = climbspeed;
                         else if(((playerent *)pl)->k_down) pl->vel.z = -climbspeed;