WIP: software/theia: Improve additional-frontend logic
requested to merge xavier_thompson/slapos:dev/theia-new-slapos-master-additional-frontend into master
Trigger additional-frontend request as soon as any of the relevant parameters is set by the user:
additional-frontend-nameadditional-frontend-sradditional-frontend-sr-urladditional-frontend-guid
Instead of only when additional-frontend-guid is set.