imap-send.c: use designated initializers for "struct imap_server_conf"

Cut down a lot on the verbosity of the "server" assignment in
imap-send.c using designated initializers, only the "ssl_verify"
member was being set to a non-NULL non-0 value.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

imap-send.c

@@ -98,17 +98,7 @@ struct imap_server_conf {
 };
 
 static struct imap_server_conf server = {
-	NULL,	/* name */
-	NULL,	/* tunnel */
-	NULL,	/* host */
-	0,	/* port */
-	NULL,	/* folder */
-	NULL,	/* user */
-	NULL,	/* pass */
-	0,   	/* use_ssl */
-	1,   	/* ssl_verify */
-	0,   	/* use_html */
-	NULL,	/* auth_method */
+	.ssl_verify = 1,
 };
 
 struct imap_socket {