Config tool: inconsistent language in air/health colours

[lahm86]

Following discussion on Discord with @Rapora9 - the drop-down options for the airbar and healthbar colours are shared, and listed as follows.

Gold (game default) could be interpreted as the default for either air or health (although it's used to distinguish between this particular gold and the alternative gold listed later). Blue does not have this differentiation, so it is felt that the following would be more suitable to show exactly what "default" refers to.