More Rubocop warnings fixed

It is now following `Fog` main repo style guide.


@plribeiro3000 That's fine.  If that's what rubocop is calling for, then the change should be made.  I just couldn't figure out which rule dictated changing to implicit proc references.  Based on the changes you made to .rubocop.yml, I still can't.  But you're showing that rubocop is flagging it, so I'm fine with the change.  If you could point out the rule flagging that, it'd help me better understand it though.