D11484: Fix combobox breakage

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: broulik, Plasma.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: Frameworks.
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REVISION SUMMARY
  https://cgit.kde.org/plasma-framework.git/commit/?id=a21bc11fe11651f6d211489ebfc8435cef877194 erroneously added `renderType` properties to PlasmaComponents3 ComboBoxes, but QML ComboBoxes don't have this property, which broke Latte Dock's settings. This patch removes it.
  
  BUG: 392026

TEST PLAN
  - Deployed, added Latte Dock, ran Plasmashell with and without `PLASMA_USE_QT_SCALING=1`, and with and without a HiDPI scale factor
  - Opened Latte Dock's settings window. In all cases, Latte Dock's settings window appeared normally and all comboboxes rendered properly
  - Opened Folder View settings and verified that all ComboBoxes there looked and worked fine, too

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  fix-combobox-breakage (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D11484

AFFECTED FILES
  src/declarativeimports/plasmacomponents3/ComboBox.qml
  src/declarativeimports/plasmastyle/ComboBoxStyle.qml

To: ngraham, broulik, #plasma
Cc: #frameworks, michaelh, ngraham
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