D17828: Don't check twice if the icon exists from ::availableSizes

[Aleix Pol Gonzalez]

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REVISION SUMMARY
  It's done by iconName() as well as by the method itself.

TEST PLAN
  Tests pass, apps still work.

REPOSITORY
  R302 KIconThemes

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17828

AFFECTED FILES
  src/kiconengine.cpp

To: apol, #frameworks
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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