revert border glow shader, keep solid group backgrounds

modules/Bar.qml

@@ -1,5 +1,4 @@
 import QtQuick
-import QtQuick.Effects
 import QtQuick.Layouts
 import Quickshell
 import Quickshell.Wayland
@@ -29,9 +28,7 @@ PanelWindow {
     }
 
     Canvas {
-        id: borderCanvas
         anchors.fill: parent
-        visible: false
 
         onPaint: {
             const ctx = getContext("2d");
@@ -97,16 +94,6 @@ PanelWindow {
         }
     }
 
-    MultiEffect {
-        source: borderCanvas
-        anchors.fill: borderCanvas
-        shadowEnabled: true
-        shadowColor: M.Theme.base0D
-        shadowBlur: 0.4
-        shadowVerticalOffset: 2
-        shadowHorizontalOffset: 0
-    }
-
     Item {
         anchors.fill: parent
         anchors.topMargin: 3