Revert r1511278 and r1511273, removing a test I added to reproduce what
I assumed was a bug. But I don't believe there is a bug. The behaviour of
'svn diff' in the test case is correct, based on the meaning of -rPREV
being strictly COMMITTED-1.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1511614 13f79535-47bb-0310-9956-ffa450edef68