t/t5515-fetch-merge-logic.sh: Add two more tests

They test the behaviour with just a URL in the command line.
Signed-off-by: NSanti B,Ai(Bjar <sbejar@gmail.com>
Signed-off-by: NJunio C Hamano <junkio@cox.net>

t/t5515-fetch-merge-logic.sh

@@ -114,6 +114,7 @@ done >> tests
 # neither in the Pull: or .fetch config
 for branch in master br-unconfig ; do
     cat <<EOF
+$branch ../.git
 $branch ../.git one
 $branch ../.git one two
 $branch --tags ../.git

t/t5515/fetch.br-unconfig_.._.git

+# br-unconfig ../.git
+0567da4d5edd2ff4bb292a465ba9e64dcad9536b		../

t/t5515/fetch.master_.._.git

+# master ../.git
+0567da4d5edd2ff4bb292a465ba9e64dcad9536b		../