Fix #1418

Super careful to zero out the freight inventory when it's dissassembled

src/main/java/cam72cam/immersiverailroading/entity/Freight.java

@@ -63,6 +63,7 @@ public void onDissassemble() {
 				if (!stack.isEmpty()) {
 					getWorld().dropItem(stack.copy(), getPosition());
 					stack.setCount(0);
+					cargoItems.set(i, stack);
 				}
 			}
 		}