D4925: actually delete old theme caches

[Marco Martin]

mart created this revision.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  QStandardPaths doesn't do file search by wildcards,
  that code was never actually functional

TEST PLAN
  old kcache and rects cache files get correctly removed

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  phab/removeoldcaches

REVISION DETAIL
  https://phabricator.kde.org/D4925

AFFECTED FILES
  src/plasma/private/theme_p.cpp

To: mart, #plasma
Cc: plasma-devel, #frameworks, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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