Fixes formatting of function calls etc inside an initializer list.

We're now formatting (column limit 25):
int x = {
  avariable,
  b(alongervariable) };

This also fixes:
Aaa({
  int i;
}, aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,
                                    ccccccccccccccccc));
... where we would previously break after the '},'.

Putting the closing curly into an extra line when there's a break
directly after the first curly will be done in a subsequent patch.

Paired with djasper.