fix: double totalWeight

We call `totalWeight += obj.weight` two times, so the `totalWeight` is double

Author: NamPNQ

src/tools/KeyStore.js

@@ -13,8 +13,6 @@ export default class KeyStore {
     keys.forEach((key) => {
       let obj = createKey(key)
 
-      totalWeight += obj.weight
-
       this._keys.push(obj)
       this._keyMap[obj.id] = obj