t9001-send-email.sh: fix quoting for mailrc --dump-aliases test

The .mailrc alias file format documents that multiple addresses are separated by spaces. The alias file used in the t9001 --dump-aliases mailrc test have addresses which include both a name and email. These are unquoted, so git send-email will parse this as an alias that translates to multiple independent addresses. The existing test does not care about this, as --dump-aliases only dumps the alias and not the address. However, it is incorrect for a future where --dump-aliases could also dump the mail addresses. Fix the test to quote the aliases properly, so that they translate to a single address. Signed-off-by: Jacob Keller <jacob.keller@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>