Correct ServerActiveObject's virtual getArmorGroups() to be const.

Due to commit ec3142a , UnitSAO's getArmorGroups() did not match
ServerActiveObject's, notably resulting in the lua get_armor_groups() call
returning nothing.

diff --git a/src/serverobject.h b/src/serverobject.h
index 42eed071051ed85178429575e55689bfe969bef2..08f7a7e5878e3f6c1f719a91f083ded2452ed294 100644 (file)
--- a/src/serverobject.h
+++ b/src/serverobject.h
@@ -147,7 +147,7 @@ public:
 
        virtual void setArmorGroups(const ItemGroupList &armor_groups)
        {}
-       virtual const ItemGroupList &getArmorGroups()
+       virtual const ItemGroupList &getArmorGroups() const
        { static ItemGroupList rv; return rv; }
        virtual void setPhysicsOverride(float physics_override_speed, float physics_override_jump, float physics_override_gravity)
        {}