[MenuSeparator] Remove padding, use normal separator weight

style/qtquickcontrols/MenuSeparator.qml

@@ -18,12 +18,8 @@ T.MenuSeparator {
     hoverEnabled: false
     focusPolicy: Qt.NoFocus
 
-    padding: Kirigami.Units.smallBorder
-    verticalPadding: Kirigami.Units.verySmallSpacing
-
     contentItem: Kirigami.Separator {
         implicitWidth: 188
         implicitHeight: 1
-        weight: Kirigami.Separator.Weight.Light
     }
 }