Use Vanilla Minecart Speeds

CraftBukkit changed the values on flying speed, restore back to vanilla

Might help #1658

Spigot-Server-Patches/0407-Use-Vanilla-Minecart-Speeds.patch

@@ -0,0 +1,27 @@
+From ba4a67a8ef2297d66890683df14305f14353a107 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Thu, 8 Nov 2018 21:33:09 -0500
+Subject: [PATCH] Use Vanilla Minecart Speeds
+
+CraftBukkit changed the values on flying speed, restore back to vanilla
+
+diff --git a/src/main/java/net/minecraft/server/EntityMinecartAbstract.java b/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
+index 932fbff7c7..7fa1bceecb 100644
+--- a/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
++++ b/src/main/java/net/minecraft/server/EntityMinecartAbstract.java
+@@ -39,9 +39,9 @@ public abstract class EntityMinecartAbstract extends Entity implements INamableT
+     private double derailedX = 0.5;
+     private double derailedY = 0.5;
+     private double derailedZ = 0.5;
+-    private double flyingX = 0.95;
+-    private double flyingY = 0.95;
+-    private double flyingZ = 0.95;
++    private double flyingX = 0.949999988079071D; // Paper - restore vanilla precision
++    private double flyingY = 0.949999988079071D; // Paper - restore vanilla precision
++    private double flyingZ = 0.949999988079071D; // Paper - restore vanilla precision
+     public double maxSpeed = 0.4D;
+     // CraftBukkit end
+ 
+-- 
+2.19.1
+