Fix MC1243 (Distributor) off-by-one error (#1183)

* Would distribute right+1 to the right before

Co-authored-by: Apeiron <apeiron@none>

Author: ApeironTsuka

src/main/java/com/sk89q/craftbook/mechanics/ic/gates/world/items/Distributer.java

@@ -112,9 +112,9 @@ public boolean goRight() {
 
         currentIndex++;
         getSign().setLine(3, String.valueOf(currentIndex));
-        if (currentIndex >= left && currentIndex <= left+right)
+        if (currentIndex >= left && currentIndex < left+right)
             return true;
-        else if (currentIndex <= left)
+        else if (currentIndex < left)
             return false;
         else {
             currentIndex = 0;
@@ -173,4 +173,4 @@ public void onPipeTransfer(PipePutEvent event) {
 
         event.setItems(leftovers);
     }
-}
+}