Fix permission removal logic in VaultPermissionServiceWrapper

Previously, the groupRemove method incorrectly deleted the entire group instead of simply removing the specified permission. This update corrects the logic by properly retrieving the group and removing the permission, ensuring the integrity of group configurations.

plugin/src/main/java/net/thenextlvl/service/wrapper/VaultPermissionServiceWrapper.java

@@ -89,9 +89,9 @@ public boolean groupRemove(String world, String groupName, String permission) {
         var groupController = groupController();
         return Optional.ofNullable(world)
                 .map(plugin.getServer()::getWorld)
-                .map(target -> groupController.deleteGroup(group, target))
-                .orElseGet(() -> groupController.deleteGroup(group))
-                .join();
+                .flatMap(target -> groupController.getGroup(groupName, target))
+                .map(group -> group.removePermission(permission))
+                .orElse(false);
     }
 
     @Override