Make scan-for-legacy-ender-dragon config work again

Portion of diff was dropped in the mappings update commit.

Also remove the option to remove invalid statistics. The server will
automatically do this now as of... 1.13?, our option wasn't even doing anything.

Spigot-Server-Patches/Optimize-CraftBlockData-Creation.patch

@@ -7,7 +7,7 @@ Avoids a hashmap lookup by cacheing a reference to the CraftBlockData
 and cloning it when one is needed.
 
 diff --git a/src/main/java/net/minecraft/server/BlockData.java b/src/main/java/net/minecraft/server/BlockData.java
-index fbe181c1fd..bd86cd2e54 100644
+index fbe181c1f..bd86cd2e5 100644
 --- a/src/main/java/net/minecraft/server/BlockData.java
 +++ b/src/main/java/net/minecraft/server/BlockData.java
 @@ -0,0 +0,0 @@
@@ -34,7 +34,7 @@ index fbe181c1fd..bd86cd2e54 100644
 +    // Paper end
  }
 diff --git a/src/main/java/net/minecraft/server/IBlockData.java b/src/main/java/net/minecraft/server/IBlockData.java
-index bf06a90312..4d62d0093d 100644
+index 1423419b9..2d855aae6 100644
 --- a/src/main/java/net/minecraft/server/IBlockData.java
 +++ b/src/main/java/net/minecraft/server/IBlockData.java
 @@ -0,0 +0,0 @@ public interface IBlockData extends IBlockDataHolder<IBlockData> {
@@ -47,7 +47,7 @@ index bf06a90312..4d62d0093d 100644
          return this.getBlock().n(this);
      }
 diff --git a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
-index d470e2b34a..b9279d925c 100644
+index d470e2b34..b9279d925 100644
 --- a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
 +++ b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
 @@ -0,0 +0,0 @@ public class CraftBlockData implements BlockData {