Rename baby zombie movement config option

This option does not set the absolute speed of the entity as the name
implies. It sets a modifier. The default (vanilla) value of `0.5` sets
the baby zombie to move at 50% faster than the base speed.

A negative value like `-0.4` would set them to move at 40% slower.

There should be no functional changes as a result of this change, it's
just clarifying the config name.

Spigot-Server-Patches/Make-max-squid-spawn-height-configurable.patch

@@ -7,7 +7,7 @@ I don't know why upstream made only the minimum height configurable but
 whatever
 
 diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
-index b3d8fe9c68..7287bf7d9b 100644
+index 063ba6a1d..aacce432b 100644
 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 @@ -0,0 +0,0 @@ public class PaperWorldConfig {
@@ -21,7 +21,7 @@ index b3d8fe9c68..7287bf7d9b 100644
 +    }
  }
 diff --git a/src/main/java/net/minecraft/server/EntitySquid.java b/src/main/java/net/minecraft/server/EntitySquid.java
-index f8fa64959f..735d1879a8 100644
+index f8fa64959..735d1879a 100644
 --- a/src/main/java/net/minecraft/server/EntitySquid.java
 +++ b/src/main/java/net/minecraft/server/EntitySquid.java
 @@ -0,0 +0,0 @@ public class EntitySquid extends EntityWaterAnimal {