Remove Ignore invalid Marker Icon ID's in maps

Spigot has patched this issue inside MapIcon, meaning that we no longer need to maintain this patch; Spigots patch also fixes #668 in that it will verify the length of the array, as well as protect against a negative type value being fetched from the array. Only real change is that Spigots patch returns a MapIcon.Type.PLAYER, instead of the RED_MARKER as originally PR'd by Aikar.

Spigot-API-Patches/0033-Add-PlayerUseUnknownEntityEvent.patch

@@ -1,4 +1,4 @@
-From b1f22f61664ce8f0ab822528909cce74b2e868db Mon Sep 17 00:00:00 2001
+From f63d0416b0cfb04ee48688f93db07c1c439e4c1c Mon Sep 17 00:00:00 2001
 From: Jedediah Smith <jedediah@silencegreys.com>
 Date: Sat, 2 Apr 2016 05:08:36 -0400
 Subject: [PATCH] Add PlayerUseUnknownEntityEvent
@@ -6,7 +6,7 @@ Subject: [PATCH] Add PlayerUseUnknownEntityEvent
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/player/PlayerUseUnknownEntityEvent.java b/src/main/java/com/destroystokyo/paper/event/player/PlayerUseUnknownEntityEvent.java
 new file mode 100644
-index 0000000..70eeaf5
+index 00000000..70eeaf5c
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/player/PlayerUseUnknownEntityEvent.java
 @@ -0,0 +1,42 @@
@@ -53,5 +53,5 @@ index 0000000..70eeaf5
 +    }
 +}
 -- 
-2.9.3
+2.12.2