t/lib-gpg: make gpghome files writable

t/lib-gpg.sh copies the test environment's gpg home to the trash
directory and makes sure the directoty is writable.

Make sure the copied files are writable, too.

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/lib-gpg.sh

@@ -18,6 +18,7 @@ else
 		# No password given, to enable non-interactive operation.
 		cp -R "$TEST_DIRECTORY"/lib-gpg ./gpghome
 		chmod 0700 gpghome
+		chmod 0600 gpghome/*
 		GNUPGHOME="$(pwd)/gpghome"
 		export GNUPGHOME
 		test_set_prereq GPG