packagekit: Distinguishable row border color for security updates
packagekit: Distinguishable row border color for security updates

The default listing-ct-item border color (#f1f1f1) is hard to visually
distinguish from the red-ish background in security update rows. Use a
darker tint of gray to make them visible.

Fixes #7170

cockpituous/cockpit,andreasn/cockpit,stefwalter/cockpit,andreasn/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,harishanand95/cockpit,moraleslazaro/cockpit,xhad/cockpit,Scribery/cockpit,andreasn/cockpit,larskarlitski/cockpit,cockpituous/cockpit,Scribery/cockpit,SotolitoLabs/cockpit,petervo/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,mvollmer/cockpit,mareklibra/cockpit,mvollmer/cockpit,mareklibra/cockpit,cockpit-project/cockpit,larskarlitski/cockpit,harishanand95/cockpit,petervo/cockpit,Scribery/cockpit,SotolitoLabs/cockpit,xhad/cockpit,larsu/cockpit,mvollmer/cockpit,Scribery/cockpit,xhad/cockpit,michalskrivanek/cockpit,michalskrivanek/cockpit,deryni/cockpit,petervo/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,cockpit-project/cockpit,harishanand95/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,andreasn/cockpit,SotolitoLabs/cockpit,petervo/cockpit,cockpit-project/cockpit,michalskrivanek/cockpit,Scribery/cockpit,xhad/cockpit,larskarlitski/cockpit,larsu/cockpit,stefwalter/cockpit,stefwalter/cockpit,martinpitt/cockpit,cockpituous/cockpit,deryni/cockpit,larsu/cockpit,cockpit-project/cockpit,cockpituous/cockpit,xhad/cockpit,stefwalter/cockpit,garrett/cockpit,larsu/cockpit,garrett/cockpit,andreasn/cockpit,michalskrivanek/cockpit,cockpituous/cockpit,garrett/cockpit,martinpitt/cockpit,deryni/cockpit,cockpit-project/cockpit,harishanand95/cockpit,petervo/cockpit,mareklibra/cockpit,deryni/cockpit,mareklibra/cockpit,martinpitt/cockpit,petervo/cockpit,mvollmer/cockpit,larskarlitski/cockpit,Scribery/cockpit,michalskrivanek/cockpit,garrett/cockpit,harishanand95/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,larsu/cockpit,Scribery/cockpit,stefwalter/cockpit,moraleslazaro/cockpit,petervo/cockpit,deryni/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,cockpituous/cockpit,stefwalter/cockpit,larskarlitski/cockpit,larsu/cockpit,moraleslazaro/cockpit,deryni/cockpit,garrett/cockpit,harishanand95/cockpit,larskarlitski/cockpit,xhad/cockpit,mareklibra/cockpit,martinpitt/cockpit,michalskrivanek/cockpit,larskarlitski/cockpit,deryni/cockpit,moraleslazaro/cockpit,michalskrivanek/cockpit,xhad/cockpit,andreasn/cockpit,mareklibra/cockpit,harishanand95/cockpit