D17026: DictionaryComboBoxTest: Add stretch to avoid expanding Dump button

[loh tar]

loh.tar added a reviewer: Frameworks.

REPOSITORY
  R246 Sonnet

REVISION DETAIL
  https://phabricator.kde.org/D17026

To: loh.tar, #frameworks
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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