clang-format: Only special-case top-level */& in multivar-declstmts.

Before (even with PointerAlignment: Left):
  vector<int *> a, b;

After:
  vector<int*> a, b;

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@282410 91177308-0d34-0410-b5e6-96231b3b80d8