Fix EffKill failing to kill entities (#8505)

Author: bluelhf

src/main/java/ch/njol/skript/effects/EffKill.java

@@ -52,7 +52,7 @@ protected void execute(Event event) {
 			if (entity instanceof Damageable damageable) {
 				if (SUPPORTS_DAMAGE_SOURCE) {
 					EntityDamageEvent.DamageCause cause = EntityDamageEvent.DamageCause.KILL;
-					HealthUtils.damage(damageable, 100 + damageable.getHealth(), DamageUtils.getDamageSourceFromCause(cause));
+					HealthUtils.damage(damageable, Double.POSITIVE_INFINITY, DamageUtils.getDamageSourceFromCause(cause));
 				} else {
 					HealthUtils.setHealth(damageable, 0);
 					HealthUtils.damage(damageable, 1);