added time since last bitnode timer

src/SaveObject.js

@@ -503,8 +503,10 @@ function loadImportedGame(saveObj, saveString) {
     var time = numCyclesOffline * Engine._idleSpeed;
     if (Player.totalPlaytime == null) {Player.totalPlaytime = 0;}
     if (Player.playtimeSinceLastAug == null) {Player.playtimeSinceLastAug = 0;}
+    if (Player.playtimeSinceLastBitnode == null) {Player.playtimeSinceLastBitnode = 0;}
     Player.totalPlaytime += time;
     Player.playtimeSinceLastAug += time;
+    Player.playtimeSinceLastBitnode += time;
 
     //Re-apply augmentations
     Player.reapplyAllAugmentations();