Fix libhooktick.js

I've sorted the whole libhooktick mess out,

mods/libhooktick.js

@@ -1,14 +1,14 @@
 let __registeredTickCallbacks = [];
 window.addEventListener("load", ()=>{
+  let oldTick = tick;
   clearInterval(tickInterval);
-  const oldTick = tick;
-  tickInterval = setInterval(tick, 1000/tps);
   tick = function(){
     oldTick();
     __registeredTickCallbacks.forEach(func=>{
       func();
     });
   }
+  tickInterval = setInterval(tick, 1000/tps);
 });
 function everyTick(callback){
   __registeredTickCallbacks.push(callback);