clang-format: Fix incorrect space after "<".

Before:
  bool a = 2 <::SomeFunction();

After:
  bool a = 2 < ::SomeFunction();

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@220505 91177308-0d34-0410-b5e6-96231b3b80d8