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)

• Set upstream metadata fields: Repository. (upstream-metadata-missing-repository)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/switcheroo-control/6a717bc1-f1e9-4b1f-8d68-289bf190fc86.

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/fc/07f5a7426b4dacaa967a268dcfd666dd09b045.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/5d/3566a24b4aa7b1dc4787e05871bce8e5e9fdaa.debug

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

Control files of package switcheroo-control-dbgsym: lines which differ (wdiff format)

• Build-Ids: 5d3566a24b4aa7b1dc4787e05871bce8e5e9fdaa fc07f5a7426b4dacaa967a268dcfd666dd09b045

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