Fixed single-use soulbound on paper

eco-core/core-plugin/src/main/kotlin/com/willfp/ecoenchants/enchant/impl/hardcoded/EnchantmentSoulbound.kt

@@ -69,7 +69,18 @@ class EnchantmentSoulbound(
 
             // Use native paper method
             if (Prerequisite.HAS_PAPER.isMet) {
-                event.itemsToKeep += items
+                val modifiedItems = if (enchant.config.getBool("single-use")) {
+                    items.map {
+                        val meta = it.itemMeta
+                        meta.removeEnchant(enchant.enchantment)
+                        it.itemMeta = meta
+                        it
+                    }
+                } else {
+                    items
+                }
+
+                event.itemsToKeep += modifiedItems
                 return
             }