Rename variables in pathfinding.c to be more clear

game/main.c

@@ -275,7 +275,7 @@ void render(float dt, void *userData) {
                     },
                 .target=(TilePosition) {tileX, tileY},
                 .map=&game->map,
-                .heap=heap,
+                .openSet=heap,
                 .outPath=&path,
                 .pool=game->pools.pathData
         });