[DRE-maint] Bug#1035658: Remove ruby array formatting when generating upstream contact in copyright

[Praveen Arimbrathodiyil]

Package: gem2deb
Severity: wishlist
Version: 2.1

For example, ruby-openai.gemspec has

   spec.authors       = ["Alex"]
   spec.email         = ["alexrudall at users.noreply.github.com"]

This was resulted in
Upstream-Contact: ["alexrudall at users.noreply.github.com"]

At least [" and "] should be removed (ftp masters once commented when I 
did not remove it). Ideally it should be
Upstream-Contact: Alex <alexrudall at users.noreply.github.com>

(@ replaced with at).
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