Hardcoded mousemacs theme path could use user-emacs-directory

[Duncan-Britt]

Hi, I was checking this out and I ran into an error because I started emacs with emacs --init-directory=~/code/mousemacs, but the path to the expected init directory is hardcoded in mousemacs-theme.el on lines 17 and 18. Was an easy fix with the user-emacs-directoryvariable.