clang-format: Fix space between generic type parameter and square
bracket

Before:
  public Foo<X, Y> [] foos;

After:
  public Foo<X, Y>[] foos;

Patch by Harry Terkelsen. Thank you!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@222283 91177308-0d34-0410-b5e6-96231b3b80d8