A bug in the confirm component

There is a bug on the confirm component.

If I bind a variable `false` as v-model to the `Confirm` component, the variable will be initialized `undefined` instead of `false`, so I read the related source code:

in the 'src/components/confirm/index.vue'

```
created () {
this.showValue = this.show
if (this.value) {
this.showValue = this.value
}
},
```

`this.show` is not defined in this file.

Start in src/components/confirm/index.vue and inspect the created hook and the v-model value flow. Reproduce the case where v-model is bound to false, then verify that the bound value remains false after initialization and run the relevant component checks available in the repository.

Vom Indexierungsmodell aus dem Issue-Text verfasst.