Description of problem: There is GateIn skin preview instead of JPP when changing skin in portal.
Created attachment 793654 [details] wrong skin preview picture
I forgot to mention that in classic portal it changes to GateIn skin, but in Mobile portal there is JPP skin.
Aimed for 6.1.1
https://github.com/gatein-prod/gatein-portal/pull/31
Merged to 3.6.x-prod and 3.6.3.Final-prod branches.