Mass: prepare decals for edition.

src/Mass/Mass.cpp

@@ -585,6 +585,7 @@ void Mass::getArmourParts() {
         }
 
         if(decals_array->items.size() != 8) {
+            part.demoDecals = decals_array->items.size();
             _demo = true;
         }
 

src/Mass/Mass.h

@@ -85,6 +85,7 @@ struct ArmourPart {
     std::string slot;
     Int id = 0;
     Containers::StaticArray<4, Int> styles{ValueInit};
+    UnsignedInt demoDecals = 8;
     Containers::StaticArray<8, Decal> decals{ValueInit};
     Containers::StaticArray<8, Accessory> accessories{ValueInit};
 };