D24847: KCM Icons fix theme selected when we hit delete theme

[Benjamin Port]

bport created this revision.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
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REVISION SUMMARY
  CUrrently when we delete a theme the next one is selected. With this fix we stay on the currently selected one and to simplify code don't allow to delete the currently selected theme

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D24847

AFFECTED FILES
  kcms/icons/iconsmodel.cpp
  kcms/icons/main.cpp
  kcms/icons/package/contents/ui/main.qml

To: bport
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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