send-email: Update regex parsing for pine aliases

The pine address book format is tab seperated and the first field
is the nickname/alias and the third field is the email address as
per:

http://www.washington.edu/pine/tech-notes/low-level.html

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-send-email.perl

@@ -237,7 +237,7 @@ my %parse_alias = (
 			$aliases{$1} = [ split(/\s+/, $2) ];
 		}}},
 	pine => sub { my $fh = shift; while (<$fh>) {
-		if (/^(\S+)\s+(.*)$/) {
+		if (/^(\S+)\t.*\t(.*)$/) {
 			$aliases{$1} = [ split(/\s*,\s*/, $2) ];
 		}}},
 	gnus => sub { my $fh = shift; while (<$fh>) {