clang-format: Fixed formatting of JavaScript container literals

Before:
  var arr = [ 1, 2, 3 ];
  var obj = {a : 1, b : 2, c : 3};

After:
  var arr = [1, 2, 3];
  var obj = {a: 1, b: 2, c: 3};

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199317 91177308-0d34-0410-b5e6-96231b3b80d8