Polish bar icon spacing

shell/plugins/panels/monitor/Panel.qml

@@ -343,6 +343,9 @@ Panel {
     bar: root.bar
     text: root.displays.length > 1 ? "󰍺" : "󰍹"
     fontSize: Style.font.subtitle
+    fixedWidth: root.bar && root.bar.vertical ? -1 : Style.space(27)
+    fixedHeight: root.bar && root.bar.vertical ? Style.space(26) : -1
+    rightExtraMargin: 4
     onPressed: function(b) { root.toggle() }
     onWheelMoved: function(delta) {
       if (root.brightnessAvailable) root.setBrightness(root.brightnessPercent + (delta > 0 ? 5 : -5))