fix: Fixes an issue where adding a new user allowed an invalid role choice
fix: Fixes an issue where adding a new user allowed an invalid role choice

- as reported by: Vytautas Paulikas and Robert Giruckas from SEC Consult.

SteveClement/MISP,FloatingGhost/MISP,MISP/MISP,Rafiot/MISP,FloatingGhost/MISP,FloatingGhost/MISP,cristianbell/MISP,FloatingGhost/MISP,Rafiot/MISP,SteveClement/MISP,FIRSTdotorg/MISP,cristianbell/MISP,cristianbell/MISP,MISP/MISP,TheDr1ver/MISP,SteveClement/MISP,FIRSTdotorg/MISP,FIRSTdotorg/MISP,devnull-/MISP,MISP/MISP,MISP/MISP,FIRSTdotorg/MISP,devnull-/MISP,crruthe/MISP,crruthe/MISP,crruthe/MISP,SteveClement/MISP,Rafiot/MISP,devnull-/MISP,crruthe/MISP,cristianbell/MISP,MISP/MISP,TheDr1ver/MISP,Rafiot/MISP,TheDr1ver/MISP,TheDr1ver/MISP,devnull-/MISP,SteveClement/MISP