SPIGOT-1569: Remove negative itemstack data filtering

nms-patches/ItemStack.patch

@@ -199,7 +199,7 @@
              if (this.item != null) {
                  this.item.a(this.tag);
              }
-@@ -164,6 +304,26 @@
+@@ -164,9 +304,29 @@
      }
  
      public void setData(int i) {
@@ -225,7 +225,11 @@
 +        // CraftBukkit end
          this.damage = i;
          if (this.damage < 0) {
-             this.damage = 0;
+-            this.damage = 0;
++            // this.damage = 0; // CraftBukkit - remove this.
+         }
+ 
+     }
 @@ -216,6 +376,12 @@
                          this.count = 0;
                      }