D9043: Use a distinct and more appropriate icon for Layers

[Nathaniel Graham]

ngraham edited the test plan for this revision.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D9043

To: ngraham, aacid, #okular
Cc: rkflx, gassaf, ngraham, aacid