Add static declaration to `populateCategories`
Add static declaration to `populateCategories`

Add static declaration to `PermissionKeyCategory::populateCategories()`


Former-commit-id: 0138f422cd20c218fba416b764045275c8456b4a
haeflimi/concrete5,hissy/concrete5,mlocati/concrete5,acliss19xx/concrete5,MrKarlDilkington/concrete5,concrete5/concrete5,biplobice/concrete5,mlocati/concrete5,mainio/concrete5,acliss19xx/concrete5,haeflimi/concrete5,biplobice/concrete5,deek87/concrete5,jaromirdalecky/concrete5,a3020/concrete5,rikzuiderlicht/concrete5,hissy/concrete5,olsgreen/concrete5,MrKarlDilkington/concrete5,MrKarlDilkington/concrete5,KorvinSzanto/concrete5,olsgreen/concrete5,concrete5/concrete5,a3020/concrete5,rikzuiderlicht/concrete5,mainio/concrete5,hissy/concrete5,KorvinSzanto/concrete5,triplei/concrete5-8,rikzuiderlicht/concrete5,biplobice/concrete5,biplobice/concrete5,deek87/concrete5,jaromirdalecky/concrete5,mainio/concrete5,hissy/concrete5,jaromirdalecky/concrete5,mlocati/concrete5,deek87/concrete5,concrete5/concrete5,acliss19xx/concrete5,triplei/concrete5-8,jaromirdalecky/concrete5,mlocati/concrete5,triplei/concrete5-8,haeflimi/concrete5,concrete5/concrete5,haeflimi/concrete5,deek87/concrete5,olsgreen/concrete5,KorvinSzanto/concrete5