EXTRA_MPART_TYPE has frivolous piece in regex

[Adam Katz]

From SA's perspective, since we don't use $& or its kin, a regex that
starts with an optional portion is the same as not having it.  Therefore:

header EXTRA_MPART_TYPE         Content-Type =~ /(?:\s*multipart\/)?.*
type=/i

is functionally equivalent to the faster/simpler:

header EXTRA_MPART_TYPE         Content-Type =~ / type=/i

I could just remove that frivolous portion, but I wonder if something
else was intended...

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