Fix some issues reported by lintian

Fix some issues reported by lintian

• Set upstream metadata fields: Repository. (upstream-metadata-missing-repository)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)

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/dc/0025df5f7be87f942380f6f615c9609628a33b.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/f6/6bf985cf1d1b15dd8a45b4d1064bc0d1078cde.debug

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

No differences were encountered between the control files of package **libqnodeeditor2**

Control files of package libqnodeeditor2-dbgsym: lines which differ (wdiff format)

• Build-Ids: f66bf985cf1d1b15dd8a45b4d1064bc0d1078cde dc0025df5f7be87f942380f6f615c9609628a33b

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Build and test logs for this branch can be found at https://janitor.debian.net/run/2f455294-571b-4e11-951b-122bc02ae245.