clang-format: Fix broken test.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220374 91177308-0d34-0410-b5e6-96231b3b80d8
clang-format: Use AllowShortBlocksOnASingleLine for ObjC blocks, too.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220375 91177308-0d34-0410-b5e6-96231b3b80d8