In /skills, auto select skill if there's only one

MMOCore-API/src/main/java/net/Indyuce/mmocore/gui/SkillList.java

@@ -508,6 +508,15 @@ public class SkillList extends EditableInventory {
             enablePagination(skillSlots.size());
         }
 
+        @Override
+        public void onOpen() {
+
+            // Auto select skill if there is only one skill slot
+            if (skillSlots.size() == 1) {
+                selected = skills.get(getPageIndex(0));
+            }
+        }
+
         @Override
         public @NotNull String getRawName() {
             return guiName.replace("{skill}", selected.getSkill().getName());