testsuite: Don't initialize mail storage with mail_full_filesystem_ac…

…cess=yes.

Recent changes in Dovecot make slashes allowed in mailbox names when this flag
is set. This flag is not useful for the test suite and it breaks one of the
tests because slashes are no longer invalid when this flag is set.

src/testsuite/testsuite-mailstore.c

@@ -94,7 +94,6 @@ void testsuite_mailstore_init(void)
 		(mail_user->pool, "maildir:", testsuite_mailstore_location, NULL);
 	mail_set->mail_attribute_dict = p_strconcat
 		(mail_user->pool, "file:", testsuite_mailstore_attrs, NULL);
-	mail_set->mail_full_filesystem_access = TRUE;
 	ns->mail_set = mail_set;
 
 	if (mail_storage_create(ns, "maildir", 0, &error) < 0)