Properly delegate setChanged in combined container slot

src/main/kotlin/ru/dbotthepony/mc/otm/container/CombinedContainer.kt

@@ -34,6 +34,10 @@ class CombinedContainer(containers: Stream<Pair<Container, Iterable<Int>>>) : IM
 		override val container: Container
 			get() = this@CombinedContainer
 
+		override fun setChanged() {
+			outer.setChanged()
+		}
+
 		override fun component1(): Int {
 			return super.component1()
 		}