Remove commented out code

Co-Authored-By: nallath <nallath@gmail.com>

plugins/PreviewStage/PreviewMenu.qml

@@ -40,7 +40,6 @@ Item
         Row
         {
             anchors.centerIn: parent
-            //spacing: UM.Theme.getSize("default_margin").width
             height: parent.height
 
             Cura.ExpandableComponent
@@ -138,4 +137,4 @@ Item
             }
         }
     }
-}
+}