lookandfeel: Update system-reboot-symbolic icon
lookandfeel: Hack to select the second login manager session

The first one is Failsafe and the second one, at least on Maui,
is always the Hawaii session because no other session is available.

Unfortunately the last session index from sddm is broken, this forces me
to do this hack so Maui 0.4.0 live image will work.