D27113: Delete cache when resetting user settings

[Filip Fila]

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

REVISION SUMMARY
  Apparently SDDM's cache is not always allowing for a clean reset of user theming preferences so we can delete it when performing the reset.
  
  BUG: 417057
  FIXED-IN: 5.18.0

TEST PLAN
  The folder was deleted (but got created again by SDDM when logging in again)

REPOSITORY
  R123 SDDM Configuration Panel (KCM)

BRANCH
  delete-sddm-cache (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D27113

AFFECTED FILES
  sddmauthhelper.cpp

To: filipf, davidedmundson
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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