[Test Fix] Fix broken test Index/comment-objc-parameterized-classes.m

I broke this test in D45498 when I changed the formatter to remove
spaces before Objective-C lightweight generics.

This fixes the test.

Test Plan:
  % make -j16 check-llvm-tools-llvm-lit && ./bin/llvm-lit -sv ../llvm/tools/clang/test/Index/comment-objc-parameterized-classes.m

llvm-svn: 329921