Add bounds check to use of edteleportent

edteleportent is a global variable that gets assigned whenever the
player collides with a warp token, and gets read from later down the
line in gamelogic(). While I don't know of any way to cause anything bad
with this (and I did try), storing a temporary indexing variable like
this is only bound to be a liability in the future - so we might as well
prevent badness now by adding a bounds check here.

desktop_version/src/Logic.cpp

@@ -1188,7 +1188,7 @@ void gamelogic(void)
 
         //Warp tokens
         if (map.custommode){
-            if (game.teleport)
+            if (game.teleport && INBOUNDS_VEC(game.edteleportent, obj.entities))
             {
                 int edi=obj.entities[game.edteleportent].behave;
                 int edj=obj.entities[game.edteleportent].para;