Fix incompatibility between Timer in node and browser

src/gameConfig.ts

@@ -81,7 +81,7 @@ class ConfigView extends Vue {
             clearInterval(this.intervalId)
             this.config.started = false
         } else {
-            this.intervalId = setInterval(() => {
+            this.intervalId = window.setInterval(() => {
                 let l = getLife()
                 if (l) l.stepGame()
                 render()