D23850: Use more appropriate icon that's colorful at small sizes

[Nathaniel Graham]

ngraham created this revision.
ngraham added a reviewer: VDG.
Herald added a subscriber: kde-utils-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  The current icon does not follow the recommended pattern of using `preferences-` icons
  and has a small version that's monochrome, causing the sidebar in System Settings to
  inappropriately display some small monochrome icons.

TEST PLAN
  F7338629: Colorful icon.png <https://phabricator.kde.org/F7338629>

REPOSITORY
  R363 Print Manager

BRANCH
  use-appropriate-icon (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D23850

AFFECTED FILES
  printer-manager-kcm/kcm_printer_manager.desktop

To: ngraham, #vdg
Cc: kde-utils-devel
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