Fix some issues reported by lintian

Fix some issues reported by lintian

• Trim trailing whitespace. (file-contains-trailing-whitespace)
• Use secure copyright file specification URI. (insecure-copyright-format-uri)
• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Update standards version to 4.4.1, no changes needed. (out-of-date-standards-version)

This merge proposal was created automatically by the Janitor bot.

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/xfce4-netload-plugin/a1990ffd-6fe9-42f6-aea5-1a509a02dfbf.

Debdiff

These changes affect the binary packages:

File lists identical (after any substitutions)

Control files of package xfce4-netload-plugin: lines which differ (wdiff format)

• Homepage: [-http​://goodies.xfce.org/-] {+https​://goodies.xfce.org/+}

No differences were encountered between the control files of package **xfce4-netload-plugin-dbgsym**

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