Fix for daemon mode on Cocoa Emacs

Original code decides whether this emacs is Cocoa Emacs by value of
window-system is `ns` or not. But daemon mode is enabled, value of
window-system is nil so init-load.el makes wrong a decision.

So I added new conditions.
 - This emacs is not carbon Emacs.
 - window-system is nil
 - system-type is 'darwin

Its emacs is Cocoa Emacs if all conditions are met.

This fixes #13