Fix wrong diff applying delta twice (#10959)

patches/server/Add-entity-knockback-events.patch

@@ -18,6 +18,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      }
  
      public void push(double deltaX, double deltaY, double deltaZ) {
+-        this.setDeltaMovement(this.getDeltaMovement().add(deltaX, deltaY, deltaZ));
 +        // Paper start - Add EntityKnockbackByEntityEvent and EntityPushedByEntityAttackEvent
 +        this.push(deltaX, deltaY, deltaZ, null);
 +    }
@@ -33,9 +34,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        }
 +        this.setDeltaMovement(this.getDeltaMovement().add(delta.getX(), delta.getY(), delta.getZ()));
 +        // Paper end - Add EntityKnockbackByEntityEvent and EntityPushedByEntityAttackEvent
-         this.setDeltaMovement(this.getDeltaMovement().add(deltaX, deltaY, deltaZ));
          this.hasImpulse = true;
      }
+ 
 diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/world/entity/LivingEntity.java