Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)
• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)
• Set upstream metadata fields: Repository. (upstream-metadata-missing-repository)

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/gnome-contacts/e95c2b3c-5ef3-47b4-8d21-27e475df63fd.

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/0e/ede63f1b885d4c501d553cbae6cb8e3dd8e408.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/a0/723da5e73f677d2da74c5b87fa965d4f0a8db4.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/e6/d8371807afb084373194790cb9368e83a87482.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/3b/4318ceabcace89eaf38369ea30e1ad83257748.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/ab/7b99a4beca7e5298e46e90d2b1e22341697cb2.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/fa/cc499a2176c550bf37dd072faa39e7f67a33e3.debug

No differences were encountered between the control files of package **gnome-contacts**

Control files of package gnome-contacts-dbgsym: lines which differ (wdiff format)

• Build-Ids: 3b4318ceabcace89eaf38369ea30e1ad83257748 ab7b99a4beca7e5298e46e90d2b1e22341697cb2 facc499a2176c550bf37dd072faa39e7f67a33e3 0eede63f1b885d4c501d553cbae6cb8e3dd8e408 a0723da5e73f677d2da74c5b87fa965d4f0a8db4 e6d8371807afb084373194790cb9368e83a87482

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