Fix upgrade tooltips not appearing after buying an upgrade

gorge.js

@@ -501,6 +501,7 @@ function createUpgrades() {
     button.appendChild(buttonName);
     button.appendChild(upgradeIcon);
 
+    button.addEventListener("mouseenter", function(e) { upgradeTooltip(key, e); });
     button.addEventListener("mousemove", function(e) { upgradeTooltip(key, e); });
     button.addEventListener("mouseleave", function() { upgradeTooltipRemove(); });
     button.addEventListener("click", function(e) { buyUpgrade(key, e); });