D15999: Add icons with added background to system.svgz

[Nathaniel Graham]

ngraham added a dependent revision: D16031: [SDDM theme] remove blur and increase UI contrast so it's not required.

REPOSITORY
  R242 Plasma Framework (Library)

REVISION DETAIL
  https://phabricator.kde.org/D15999

To: pstefan, ngraham, #vdg
Cc: filipf, kde-frameworks-devel, michaelh, ngraham, bruns
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