D24918: Fix issue when there is no WidgetStyle value in kdeglobals

[Cyril Rossi]

crossi created this revision.
crossi added reviewers: Plasma, ervin, bport, mart.
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REVISION SUMMARY
  KConfig XT does not store default values in conf files. KCM Style applying default style, KHintsSetting expect a value in kdeglobals or ignore the notify change.
  fix to provide a default value to allow applying default widget style.

REPOSITORY
  R135 Integration for Qt applications in Plasma

REVISION DETAIL
  https://phabricator.kde.org/D24918

AFFECTED FILES
  src/platformtheme/khintssettings.cpp

To: crossi, #plasma, ervin, bport, mart
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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