formula: copy hidden files _from_ bottles.

[Bo98]

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In #6708 I fixed a situation where hidden files in etc or var were not copied into bottles. And that has worked. I can confirm the MariaDB bottles all now have .homebrew_dont_prune_me. I thought it already was working copying from bottles as well - and I wasn't alone in that (see Homebrew/homebrew-core#46252 in which another user confirmed installing the new bottles worked).

I've discovered a case however, on clean installs, that those files might not be copied from the bottle, which I hope to fix here.

The situation is very similar to the other pull request: glob doesn't return dotfiles while find does.

[MikeMcQuaid]

Thanks again @Bo98!