Fix fixItemsMergingThroughWalls check (#9707)

patches/server/Add-option-to-fix-items-merging-through-walls.patch

@@ -13,9 +13,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
  
                  if (entityitem.isMergable()) {
 +                    // Paper start - Fix items merging through walls
-+                    if (this.level().clipDirect(this.position(), entityitem.position(),
-+                        net.minecraft.world.phys.shapes.CollisionContext.of(this)) == net.minecraft.world.phys.HitResult.Type.BLOCK) {
-+                        continue;
++                    if (this.level().paperConfig().fixes.fixItemsMergingThroughWalls) {
++                        if (this.level().clipDirect(this.position(), entityitem.position(),
++                            net.minecraft.world.phys.shapes.CollisionContext.of(this)) == net.minecraft.world.phys.HitResult.Type.BLOCK) {
++                            continue;
++                        }
 +                    }
 +                    // Paper end - Fix items merging through walls
                      this.tryToMerge(entityitem);