SPIGOT-6708: Fix Experience Orb value not being updated in mend event

nms-patches/net/minecraft/world/entity/EntityExperienceOrb.patch

@@ -54,7 +54,7 @@
                  }
  
                  --this.count;
-@@ -243,6 +265,13 @@
+@@ -243,9 +265,17 @@
          if (entry != null) {
              ItemStack itemstack = (ItemStack) entry.getValue();
              int j = Math.min(this.c(this.value), itemstack.getDamage());
@@ -68,7 +68,11 @@
  
              itemstack.setDamage(itemstack.getDamage() - j);
              int k = i - this.b(j);
-@@ -270,6 +299,24 @@
++            this.value = k; // CraftBukkit - update exp value of orb for PlayerItemMendEvent calls
+ 
+             return k > 0 ? this.a(entityhuman, k) : 0;
+         } else {
+@@ -270,6 +300,24 @@
      }
  
      public static int getOrbValue(int i) {