swaynag not installed by default

[m4u9]

We need swaynag to be added to the pattern, so that we can display warning messages etc, already set in the basic config

[sfalken]

https://build.opensuse.org/request/show/1077614

[m4u9]

thanks for adding it to the pattern, however it turns out swaynag is not needed because we use a custom $mode_system config instead. I guess swaynag could be removed from the pattern in a later update.