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/Use-asynchronous-Log4j-2-loggers.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Use asynchronous Log4j 2 loggers
 
 
 diff --git a/pom.xml b/pom.xml
-index b28f8e0929..6d8b27e927 100644
+index f4dcd8564..282410a22 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@
@@ -24,7 +24,7 @@ index b28f8e0929..6d8b27e927 100644
              <artifactId>asm</artifactId>
 diff --git a/src/main/resources/log4j2.component.properties b/src/main/resources/log4j2.component.properties
 new file mode 100644
-index 0000000000..ee7c90784c
+index 000000000..ee7c90784
 --- /dev/null
 +++ b/src/main/resources/log4j2.component.properties
 @@ -0,0 +1 @@