Utils: Make TreeViews use setUniformRowHeights by default

When applicable, the flag makes a significant difference in
performacnce. However is easily forgotten in cases where it
is applicable, and cases where it is accidentally used are
easily spotted visually. So arguably, opt-out is a better
default than opt-in.

Change-Id: I88aeb05b42533ba4e23c39573a3ddd016343cd55
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/qmlprofiler/quick3dframeview.cpp

@@ -118,6 +118,7 @@ void Quick3DFrameView::onVisibleFeaturesChanged(quint64)
 Quick3DMainView::Quick3DMainView(Quick3DFrameModel *model, bool compareView, QWidget *parent)
     : Utils::TreeView(parent), m_model(model), m_compareView(compareView)
 {
+    setUniformRowHeights(false);
     setObjectName("Quick3DMainView");
     setFrameStyle(QFrame::NoFrame);
     QHeaderView *h = header();