use correct variable name in js eval

Author: granny

purpur-server/minecraft-patches/sources/net/minecraft/world/entity/monster/Shulker.java.patch

@@ -37,7 +37,7 @@
 +            if (!this.level().purpurConfig.shulkerSpawnFromBulletNearbyEquation.isBlank()) {
 +                int shulkerCount = this.level().getEntities((net.minecraft.world.level.entity.EntityTypeTest) EntityType.SHULKER, oldAabb.inflate(this.level().purpurConfig.shulkerSpawnFromBulletNearbyRange), Entity::isAlive).size();
 +                try {
-+                    failureChance -= ((Number) scriptEngine.eval("let shulkerCount = " + shulkerCount + "; " + this.level().purpurConfig.shulkerSpawnFromBulletNearbyEquation)).floatValue();
++                    failureChance -= ((Number) scriptEngine.eval("let nearby = " + shulkerCount + "; " + this.level().purpurConfig.shulkerSpawnFromBulletNearbyEquation)).floatValue();
 +                } catch (javax.script.ScriptException e) {
 +                    e.printStackTrace();
 +                    failureChance -= (shulkerCount - 1) / 5.0F;