dgit: curl --proto-redir settings: do not use qw() for ...,...

This syntax generates the following spurious warning with buster's
perl (but not with stretch's):
  Possible attempt to separate words with commas at /home/ian/things/Dgit/2dgit/dgit line 103.

It seems better to keep this warning everywhere else, and using a
different syntax is easier than disabling it around this construct.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

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