If the zoom button doesn't exist use upper left corner of window frame.
If the zoom button doesn't exist use upper left corner of window frame.

Closes issue #18

hooplaaa/Amethyst,m4rw3r/Amethyst,egabancho/Amethyst,egabancho/Amethyst,olsonpm/Amethyst,cevaris/Amethyst,ianyh/Amethyst,hooplaaa/Amethyst,olsonpm/Amethyst,ianyh/Amethyst,ianyh/Amethyst,cevaris/Amethyst,ianyh/Amethyst,ianyh/Amethyst,m4rw3r/Amethyst