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/0045-IllegalPacketEvent.patch

@@ -1,4 +1,4 @@
-From bad77ff8bbca1adeb51a99369b3aaaaf5046b7ee Mon Sep 17 00:00:00 2001
+From 89165c8a70cce041d5daead1b9aadc8f214798a9 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Sun, 4 Dec 2016 01:19:14 -0500
 Subject: [PATCH] IllegalPacketEvent
@@ -9,7 +9,7 @@ Lets plugins change the kick message and if it should kick or not.
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/player/IllegalPacketEvent.java b/src/main/java/com/destroystokyo/paper/event/player/IllegalPacketEvent.java
 new file mode 100644
-index 0000000..e11f74f
+index 00000000..e11f74fc
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/player/IllegalPacketEvent.java
 @@ -0,0 +1,63 @@
@@ -77,5 +77,5 @@ index 0000000..e11f74f
 +    }
 +}
 -- 
-2.9.3
+2.12.2