t0050: known breakage vanished in merge (case change)

This test case has passed since this commit:

  commit 0047dd2
  Author: Steffen Prohaska <prohaska@zib.de>
  Date:   Thu May 15 07:19:54 2008 +0200

    t0050: Fix merge test on case sensitive file systems

Remove the known breakage by using test_expect_success

Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t0050-filesystem.sh

@@ -77,7 +77,7 @@ $test_case 'rename (case change)' '
 
 '
 
-$test_case 'merge (case change)' '
+test_expect_success 'merge (case change)' '
 
 	rm -f CamelCase &&
 	rm -f camelcase &&