Add config setting for grindstone overstacking (#8156)

patches/server/Paper-config-files.patch

@@ -578,6 +578,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        public boolean performUsernameValidation = true;
 +        @Comment("This setting controls if players should be able to create headless pistons.")
 +        public boolean allowHeadlessPistons = false;
++        @Comment("This setting controls if grindstones should be able to output overstacked items (such as cursed books).")
++        public boolean allowGrindstoneOverstacking = false;
 +    }
 +
 +    public Commands commands;