Hopefully fix splitter basin duping #557

Some more thorough testing is needed here to see whether it is actually fixed. I can't reproduce it anymore at least.

src/main/java/com/simibubi/create/content/logistics/block/belts/tunnel/BrassTunnelTileEntity.java

@@ -229,6 +229,7 @@ public class BrassTunnelTileEntity extends BeltTunnelTileEntity {
 				if (remainder == null || !remainder.isEmpty()) {
 					if (force)
 						return;
+					toDistribute = remainder;
 					continue;
 				}