`ignored_key_prefixes` not respected when deleting files

[MartijnCuppens]

This line:

laravel/src/TranslationSaver.php

Line 41 in f4e63b9

$this->filesystem->deleteDirectory($this->localePath($locale));

will delete all files in the language directory, ignoring the keys set in ignored_key_prefixes.

Some logic should be implemented to not delete the files that are ignored.