UI: Fix enter key play selected song behavior
UI: Fix enter key play selected song behavior

This fixes issue #46
ENTER does not play song

Added gocui.KeyEnter to list that contains gocui.KeyArrow* + gocui.KeySpace
in the keybinding function.

The list was too long to be declared in-line on the for loop
so the list was initalized seperately.

Signed-Off-By Zach Brown <brownzach125@gmail.com>

fabiofalci/sconsify