kodiPackages.sendtokodi: fix PYTHON_PATH conflict with Kodi and yt-dlp

The "sendtokodi" addon bundles its own versions of "youtube-dl" and
"yt-dlp". This causes two issues:

  - The "youtube-dl" addon is unmaintained and suspect to known
    vulnerabilities.

  - Both of these dependencies also exist as packaged versions, so the
    vendoring causes duplications.

The first issue is being addressed by patching out support for
"youtube-dl", which in any case is only really needed for supporting
Python 2. The second issue is being addressed by removing the bundled
version of "yt-dlp" and instead injecting our packaged version of this
dependency via `PYTHON_PATH`.

Using `PYTHON_PATH` creates some new problems though, because Kodi
packages a bunch of Python libraries like "requests" as addons. The
consequence is that we may have a conflict in our PYTHON_PATH, where
dependencies may be provided both by such Kodi addons and by transitive
dependencies of "yt-dlp".

One obvious solution would be to stop replacing the bundled version of
"yt-dlp", but that would reintroduce the second issue explained further
up.

Instead, fix the issue by replacing the bundled version of "yt-dlp" with
the contents of the packaged version thereof. This allows us to drop the
PYTHON_PATH workaround and thus resolves the conflicts.

Reported-by: Aaron Andersen <aaron@fosslib.net>

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