t1307: reorder `nongit test_must_fail`

In the future, we plan on only allowing `test_must_fail` to work on a
restricted subset of commands, including `git`. Reorder the commands so
that `nongit` comes before `test_must_fail`. This way, `test_must_fail`
operates on a git command.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t1307-config-blob.sh

@@ -74,7 +74,7 @@ test_expect_success 'can parse blob ending with CR' '
 '
 
 test_expect_success 'config --blob outside of a repository is an error' '
-	test_must_fail nongit git config --blob=foo --list
+	nongit test_must_fail git config --blob=foo --list
 '
 
 test_done