Dynamic Tabs Demo Removes Incorrect Tab

[tsmith-dev]

The dynamic tabs demo at https://jsfiddle.net/b44cc4dq/245/ removes the first tab in the array instead of the correct one due to the missing 'index' in line 4 of the demo code.

<v-tab v-for="tab in tabs" :key="tab">

should read...

<v-tab v-for="(tab,index) in tabs" :key="tab">