rack list: Set frame in ui form

resources/ui/carla_host.ui

@@ -107,7 +107,7 @@
               <enum>QFrame::NoFrame</enum>
              </property>
              <property name="frameShadow">
-              <enum>QFrame::Sunken</enum>
+              <enum>QFrame::Plain</enum>
              </property>
              <property name="verticalScrollBarPolicy">
               <enum>Qt::ScrollBarAlwaysOff</enum>

source/frontend/widgets/racklistwidget.py

@@ -242,9 +242,6 @@ class RackListWidget(QListWidget):
         self.setDropIndicatorShown(True)
         self.viewport().setAcceptDrops(True)
 
-        self.setFrameShape(QFrame.NoFrame)
-        self.setFrameShadow(QFrame.Plain)
-
     # --------------------------------------------------------------------------------------------------------
 
     def createItem(self, pluginId):