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/mesonprojectmanager/mesonbuildconfiguration.cpp

@@ -185,7 +185,6 @@ public:
         optionsTreeView->setMinimumHeight(300);
         optionsTreeView->setFrameShape(QFrame::NoFrame);
         optionsTreeView->setSelectionBehavior(QAbstractItemView::SelectItems);
-        optionsTreeView->setUniformRowHeights(true);
         optionsTreeView->setSortingEnabled(true);
 
         using namespace Layouting;