Keyboard navigation broken after calling destroy + init

[alvarotrigo]

Description

After destroying fullPage.js and initialising it again, they keyboard navigation won't work anymore.

Link to isolated reproduction with no external CSS / JS

It can be reproduced on the demo page:
https://alvarotrigo.com/fullPage/examples/methods.html

Steps to reproduce it

1. Access https://alvarotrigo.com/fullPage/examples/methods.html#firstPage
2. Click on "destroy(all)"
3. Click on "Undestroy"
4. Notice how keyboard navigation no longer works

Versions

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