Fixed an issue that could have been BIG

If someone removed an item at 0 it would do nothing. Fixed

Author: coderFlameyosFlow

src/main/java/me/flame/menus/menu/BaseMenu.java

@@ -92,7 +92,7 @@ public static void init(Plugin p) {
 
     private void remove(int index) {
         int length = this.itemMap.length;
-        if (index <= 0 || index >= length) return;
+        if (index < 0 || index >= length) return;
 
         itemMap[index] = null;
     }