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)
• Bump debhelper from old 10 to 13. (package-uses-old-debhelper-compat-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/d8/38163bd8e2e3844fb2c15b85a0f87f327e7680.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/72/18f8af8d637f868c6c0fd65daba48b6da97030.debug

Control files of package fil-plugins: lines which differ (wdiff format)

• Homepage: [-http​://kokkinizita.linuxaudio.org/linuxaudio/index.html-] {+https​://kokkinizita.linuxaudio.org/linuxaudio/index.html+}

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

• Build-Ids: 7218f8af8d637f868c6c0fd65daba48b6da97030 d838163bd8e2e3844fb2c15b85a0f87f327e7680

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/fil-plugins/f270e2db-435c-4ae4-bd92-c5ca6af6461e.