removed unused permission

Author: zefir-git

src/main/java/pro/cloudnode/smp/smpcore/Permission.java

@@ -117,11 +117,6 @@ public final class Permission {
      */
     public static @NotNull String NATION_INVITE_OTHER = "smpcore.nation.invite.other";
 
-    /**
-     * Accept request to join your nation
-     */
-    public static @NotNull String NATION_JOIN_REQUEST_ACCEPT = "smpcore.nation.join.request.accept";
-
     /**
      * Appoint nation citizen as vice-leader
      */