main: fix bugs with color management reported by a user through email.
Unfortunately, I don't think there's a way to solve this bug without the "Press any key" workaround. GetKey must be called once for the EnableColor setting to take effect. If the user went to the homescreen, then opened and closed menu, colors would get disabled because the setting would not have taken full effect on all of the OS variables.
homeGUI: fix minor bug reported by the same user.