Always write dimension NBT, even if we ignore it

DataPacks can use the dimension field for various things, so we should
still write this field to NBT, even if we ignore reading it ourselves.

Spigot-Server-Patches/0372-Ignore-Dimension-NBT-field-in-Entity-data.patch

@@ -17,15 +17,6 @@ diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/
 index 7ac07ac07ac0..7ac07ac07ac0 100644
 --- a/src/main/java/net/minecraft/server/Entity.java
 +++ b/src/main/java/net/minecraft/server/Entity.java
-@@ -1583,7 +1583,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
-             nbttagcompound.setShort("Fire", (short) this.fireTicks);
-             nbttagcompound.setShort("Air", (short) this.getAirTicks());
-             nbttagcompound.setBoolean("OnGround", this.onGround);
--            nbttagcompound.setInt("Dimension", this.dimension.getDimensionID());
-+            //nbttagcompound.setInt("Dimension", this.dimension.getDimensionID()); // Paper - always controlled by world
-             nbttagcompound.setBoolean("Invulnerable", this.invulnerable);
-             nbttagcompound.setInt("PortalCooldown", this.portalCooldown);
-             nbttagcompound.a("UUID", this.getUniqueID());
 @@ -1720,7 +1720,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
              this.setAirTicks(nbttagcompound.getShort("Air"));
              this.onGround = nbttagcompound.getBoolean("OnGround");