test/cli: Add known broken test for (missing) quoting in From

test/cli: Add known broken test for (missing) quoting in From

In [1], Jakub Wilk observes that the current behaviour is confusing
since it looks like there are two mailboxes in From, while in fact
there is only one.  It seems to me that notmuch should at least quote
the display-name part of a mailbox if it has "funny" characters in it,
and perhaps always quote it. Either way will require changing the
indexing code, since the structure is lost when writing the headers to
the database.

[1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1021614