Fix some issues reported by lintian

Fix some issues reported by lintian

• Use secure URI in Homepage field. (homepage-field-uses-insecure-uri)
• Set upstream metadata fields: Name (from ./configure), Repository. (upstream-metadata-file-is-missing)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/xfce4-terminal/8eb8da2c-ab4a-4368-8f62-28b55a6683a0.

Debdiff

These changes affect the binary packages:

File lists identical (after any substitutions)

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

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

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

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