SPIGOT-2321: Fully check Vanilla command permissions

By: md_5 <git@md-5.net>

paper-server/nms-patches/EntityPlayer.patch

@@ -492,7 +492,7 @@
 +        if ("".equals(s)) {
 +            return getBukkitEntity().isOp();
 +        }
-+        return true;
++        return getBukkitEntity().hasPermission("minecraft.command." + s);
 +        // CraftBukkit end
      }