Fix some issues reported by lintian

Fix some issues reported by lintian

• Update lintian override info format in d/source/lintian-overrides on line 2. (mismatched-override)
• Set upstream metadata fields: Repository-Browse. (upstream-metadata-file-is-missing)
• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)

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/dump1090-mutability/e33baae5-a4f6-474c-9709-d3c164120593.

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/1f/44af0e49a58ec5b8309e328855d911379bcc02.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/b7/cfa4f3410b0fee301c7c78d0ed0b76d8a927fe.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/00/e20528b70ee53d51ff18fc6e10b0f177e509ee.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/bb/7bb82f57ea0582e862de81933af1730504a901.debug

No differences were encountered between the control files of package **dump1090-mutability**

Control files of package dump1090-mutability-dbgsym: lines which differ (wdiff format)

• Build-Ids: 00e20528b70ee53d51ff18fc6e10b0f177e509ee bb7bb82f57ea0582e862de81933af1730504a901 1f44af0e49a58ec5b8309e328855d911379bcc02 b7cfa4f3410b0fee301c7c78d0ed0b76d8a927fe

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