fix: align with java entity water velocity (#1716) (#1739)

Signed-off-by: Joseph Rimmer <4097668+yuminstalljoe@users.noreply.github.com>

Author: yuminstalljoe

pumpkin/src/entity/living.rs

@@ -880,7 +880,7 @@ impl LivingEntity {
 
     async fn travel_in_fluid(&self, caller: Arc<dyn EntityBase>, water: bool) {
         let movement_input = self.movement_input.load();
-        let y0 = self.entity.pos.load().y;
+
         let falling = self.entity.velocity.load().y <= 0.0;
         let gravity = self.get_effective_gravity(&caller).await;
         let effective_speed = self.get_attribute_value(&Attributes::MOVEMENT_SPEED);
@@ -951,8 +951,6 @@ impl LivingEntity {
 
         let mut velo = self.entity.velocity.load();
 
-        velo.y += 0.6 - self.entity.pos.load().y + y0;
-
         if self.entity.horizontal_collision.load(SeqCst)
             && !self
                 .entity