Buffs no longer have the "applied" field, it was redundant

Because children of actions are always inactive in the new engine, buffs 
that are children of actions are inactive while buffs elsewhere on the 
character sheet are active, making it redundant to keep the extra field

app/imports/api/engine/computation/buildComputation/computeInactiveStatus.js

@@ -19,7 +19,6 @@ export default function computeInactiveStatus(node){
 function isActive(prop){
   if (prop.disabled) return false;
   switch (prop.type){
-    case 'buff': return !!prop.applied;
     case 'item': return !!prop.equipped;
     case 'spell': return !!prop.prepared || !!prop.alwaysPrepared;
     case 'note': return false;