D19834: Fix monochrome icons in tooltips

[Nathaniel Graham]

ngraham created this revision.
ngraham added a reviewer: Plasma.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  This patch is shamelessly stolen from Marco Martin's work in KInfoCenter (23fa369831709f43a3100476b00ced10a1123f7f <https://phabricator.kde.org/R102:23fa369831709f43a3100476b00ced10a1123f7f>) and does the same thing for System Settings' tooltips.
  
  Now Monochrome icons are displayed properly.
  
  BUG: F6698413 <https://phabricator.kde.org/F6698413>
  FIXED-IN: 5.15.4

TEST PLAN
  F6698413: Correct icons.jpeg <https://phabricator.kde.org/F6698413>

REPOSITORY
  R124 System Settings

BRANCH
  fix-monochrome-icons-in-tooltips (branched from Plasma/5.15)

REVISION DETAIL
  https://phabricator.kde.org/D19834

AFFECTED FILES
  sidebar/ToolTips/tooltipmanager.cpp

To: ngraham, #plasma
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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