Make the food powerup give 60 seconds of food production

constants.js

@@ -1114,10 +1114,10 @@ const powerups = {
     name: "Free Food",
     description: "Tasty!",
     icon: "fa-drumstick-bite",
-    effect: state => state.resources.food += 10000,
+    effect: state => state.resources.food += state.currentProductivity.food * 60,
     popup: (self, e) => {
       clickPopup("GULP!", "gulp", [e.clientX, e.clientY]);
-      clickPopup("+10000 food", "food", [e.clientX, e.clientY]);
+      clickPopup("+60 seconds of food", "food", [e.clientX, e.clientY]);
     }
   },
   "free-car": {