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/Handle-plugin-prefixes-using-Log4J-configuration.patch

@@ -15,7 +15,7 @@ This may cause additional prefixes to be disabled for plugins bypassing
 the plugin logger.
 
 diff --git a/pom.xml b/pom.xml
-index 815f9ef393..ed920ac4a0 100644
+index f34ca2285..70966a76a 100644
 --- a/pom.xml
 +++ b/pom.xml
 @@ -0,0 +0,0 @@
@@ -28,7 +28,7 @@ index 815f9ef393..ed920ac4a0 100644
          <dependency>
              <groupId>org.apache.logging.log4j</groupId>
 diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java
-index 9dca5aeda1..9584950c63 100644
+index 9dca5aeda..9584950c6 100644
 --- a/src/main/java/org/spigotmc/SpigotConfig.java
 +++ b/src/main/java/org/spigotmc/SpigotConfig.java
 @@ -0,0 +0,0 @@ public class SpigotConfig
@@ -41,7 +41,7 @@ index 9dca5aeda1..9584950c63 100644
  
      public static int playerShuffle;
 diff --git a/src/main/resources/log4j2.xml b/src/main/resources/log4j2.xml
-index 08b6bb7f97..9f8334376f 100644
+index 08b6bb7f9..9f8334376 100644
 --- a/src/main/resources/log4j2.xml
 +++ b/src/main/resources/log4j2.xml
 @@ -0,0 +0,0 @@