Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (trailing-whitespace)
• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/tktreectrl/5394e8b4-66fa-46d6-8218-1855a33f54d3.

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/0d/a479a4c0c20639b4e217c5b8afc651b58040e8.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/c2/699413bbcb1954a3a1c5a114f415f120a4cfd0.debug

Control files of package tktreectrl: lines which differ (wdiff format)

• Homepage: [-http​://tktreectrl.sourceforge.net/-] {+https​://tktreectrl.sourceforge.net/+}

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

• Build-Ids: c2699413bbcb1954a3a1c5a114f415f120a4cfd0 0da479a4c0c20639b4e217c5b8afc651b58040e8

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