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/Include-Log4J2-SLF4J-implementation.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Include Log4J2 SLF4J implementation
 
 
 diff --git a/pom.xml b/pom.xml
-index ed920ac4a0..b28f8e0929 100644
+index 70966a76a..f4dcd8564 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@