[Bug 2052800] [NEW] brltty not properly installed in initramfs

[Cigaes]

Public bug reported:

On Ubuntu 22 LTS, with brltty 6.4-4ubuntu2:

In `/share/initramfs-tools/hooks/brltty`, there is:
```
  copy_exec /bin/brltty $DESTDIR/bin/
```
but the `copy_exec` utility function already adds `$DESTDIR` to the target, it results in the binary copied at a wrong place. Indeed, on Noble:
```
  copy_exec /bin/brltty /bin
```

As a result, braille does not work to decrypt the disk at boot.

Please backport this fix to 22 LTS.

** Affects: brltty (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2052800

Title:
  brltty not properly installed in initramfs

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