t0050-*.sh: mark the rename (case change) test as passing

Since commit baa37bff ("mv: allow renaming to fix case on case
insensitive filesystems", 08-05-2014), the 'git mv' command has
been able to rename a file, to one which differs only in case,
on a case insensitive filesystem.

This results in the 'rename (case change)' test, which used to fail
prior to this commit, to now (unexpectedly) pass. Mark this test as
passing.

[jc: Ramsay's tests on Cygwin, Eric's on Mac OS X]

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Tested-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t0050-filesystem.sh

@@ -64,7 +64,7 @@ test_expect_success "setup case tests" '
 	git checkout -f master
 '
 
-$test_case 'rename (case change)' '
+test_expect_success 'rename (case change)' '
 	git mv camelcase CamelCase &&
 	git commit -m "rename"
 '