D11970: Fix typo in the kcm_desktoptheme edit theme tooltip

[Chris Holland]

Zren created this revision.
Zren added a reviewer: davidedmundson.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
Zren requested review of this revision.

REVISION SUMMARY
  Got missed during the D8006 <https://phabricator.kde.org/D8006> code review.

TEST PLAN
  Fixed it, tooltip now appears.

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D11970

AFFECTED FILES
  kcms/desktoptheme/package/contents/ui/main.qml

To: Zren, davidedmundson
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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