[p2binder] Console output for execing init_binds

[JaioCG]

I see "Hey did running exec init_binds work it didn't do anything in console" way too damn much

[ThisAMJ]

It would be changing this in mlugg.co.uk/p2binder/keypanel.js:

        file_str += `bind "${key}" "${cmd}"\n`;
    }

+   file_str += "echo Binds saved!\n";
    file_str += "host_writeconfig\n";

[mlugg]

done