Refactor moe-theme-select-color and random-color

[tanzoniteblack]

When I used to call the follow to set my theme, it would never work quite the same as if I directly called moe-theme-select-color manually.

(setq moe-theme-mode-line-color 'purple)
(powerline-moe-theme)

For example, the file completion of IDO would never change from blue. To eleminate this, I refactored the code you were using in moe-theme-select-color out into it's own function, which both moe-theme-select-color and moe-theme-random-color now both call rather than independantly recreating the same logic.

[kuanyui]

Thanks for your long-time supporting and contributions to moe-theme ˊ・ω・ˋ