"Frequently used" is broken if `init` function is called first

[srmagura]

Repro Steps

1. yarn build and yarn dev in the emoji-mart repository. The homepage will show the emoji picker with the Frequently Used section visible.
2. Now add the line EmojiMart.init({ data }) to the beginning of the JavaScript code in the example. Exact location where the line of code should be added
3. Refresh the page and the Frequently Used section will disappear from the picker.

Why it happens

I looked in the code and found that FrequentlyUsed.get() is only called in the _init function. This seems wrong to me...

As always, let me know if you want a PR. Thank you.

[srmagura]

Here's a hacktacular workaround that we will be using until this bug can be fixed properly: https://github.com/missive/emoji-mart/compare/main...spotxyz:emoji-mart:frequently-used-hack?expand=1