Correct capitalization for already capitalized pristine words

Hey, @isaachess!

So I made it so already capitalized words will have their piggified first letters capitalized.
Their original first letters will be set to lowercase.

Passing `What are you having for lunch?` will return `Atwhay areway ouyay avinghay orfay unchlay?`.

It's closer to what it would've looked like before I modified the capitalization functionality.