runtime-slector: show "seen ago" indicator like on the splash screen
runtime-slector: show "seen ago" indicator like on the splash screen

Apply the same treatment to the runtimes list like we do on the main screen.

Fixes issue #439

oportocala/noflo-ui,rasata/noflo-ui,rasata/noflo-ui,noflo/noflo-ui,taylorzane/noflo-ui,lxfschr/noflo-ui,rdf-pipeline/noflo-server,oportocala/noflo-ui,lxfschr/noflo-ui,noflo/noflo-ui,rdf-pipeline/noflo-server,taylorzane/noflo-ui