Improve color of priority options for application

[Snorre98]

This issue is related to #1575 but can be done before it.

Improve how colors for application priority is set in this component: RecruitmentApplicantsStatus

The component is used here: RecruitmentPositionOverviewPage

You can find it here: http://localhost:3000/control-panel/recruitment/{recruitmentId]/gang/{gangId]/position/{positionId}

Possible solutions

These are some possible solutions. One aspect that is entierly missing is a specific color for "Not Wanted".

Soultion one

Improve the way the colors are set in frontend.

Solution two (might be best)

Define the colors in backend, so that they they are fetched with the application options and can be set in frontend.