clang-format: Fix spacing in Cpp11 braced lists:

Before:
  vector<int> foo{ ::SomeFunction()};

After:
  vector<int> foo{::SomeFunction()};

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@198769 91177308-0d34-0410-b5e6-96231b3b80d8