Fix some issues reported by lintian

Fix some issues reported by lintian

• Set field Upstream-Contact in debian/copyright.
• Remove obsolete field Contact from debian/upstream/metadata (already present in machine-readable debian/copyright).
• Set field Upstream-Contact in debian/copyright.
• Remove obsolete field Contact from debian/upstream/metadata (already present in machine-readable debian/copyright).

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/9b/87de41d3642c170272253e7e807eab53e71ec0.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/4a/a3f2a79692a650b8c4066fed31f156d20992fc.debug

No differences were encountered between the control files of package **kodi-audioencoder-vorbis**

Control files of package kodi-audioencoder-vorbis-dbgsym: lines which differ (wdiff format)

• Build-Ids: 4aa3f2a79692a650b8c4066fed31f156d20992fc 9b87de41d3642c170272253e7e807eab53e71ec0

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This merge proposal was created by the Janitor bot, and it will automatically rebase or close this proposal as appropriate when the target branch changes. Any comments you leave here will be read by the Janitor's maintainers.

Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/kodi-audioencoder-vorbis/c56bf027-40cc-48cd-8d35-55a6e8eda4c0.