Fix some issues reported by lintian

Fix some issues reported by lintian

• debian/copyright: use spaces rather than tabs to start continuation lines. (tab-in-license-text)
• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking, upstream-metadata-missing-repository)

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/8b/8cd665ba6fcc0ba2c00b0eabd5d1db6acab4dc.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/f2/d4c905c76091b6ad8969765e68938977cf5547.debug

No differences were encountered between the control files of package **python3-bluez**

Control files of package python3-bluez-dbgsym: lines which differ (wdiff format)

• Build-Ids: f2d4c905c76091b6ad8969765e68938977cf5547 8b8cd665ba6fcc0ba2c00b0eabd5d1db6acab4dc

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/pybluez/40f5398f-640a-42f5-a772-4082e89efd75.