Core: Set template list ScrollMode in "New Dialog" to ScrollPerPixel

With the new big icons, the default ScrollMode = ScrollPerItem behavior
seems a bit unsmooth. ScrollPerPixel fixes that.

Change-Id: If4deb0f1323f70231af44a17d0b50eea9e37f10e
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/coreplugin/dialogs/newdialog.ui

@@ -123,6 +123,9 @@
      <property name="selectionBehavior">
       <enum>QAbstractItemView::SelectRows</enum>
      </property>
+     <property name="verticalScrollMode">
+      <enum>QAbstractItemView::ScrollPerPixel</enum>
+     </property>
      <property name="uniformItemSizes">
       <bool>false</bool>
      </property>