bar: ws indicator mask -> colouriser

modules/bar/components/workspaces/ActiveIndicator.qml

@@ -48,20 +48,9 @@ StyledRect {
     radius: Config.bar.workspaces.rounded ? Appearance.rounding.full : 0
     color: Colours.palette.m3primary
 
-    StyledRect {
-        id: base
-
-        visible: false
-        anchors.fill: parent
-        color: Colours.palette.m3onPrimary
-    }
-
-    MultiEffect {
-        source: base
-        maskSource: root.mask
-        maskEnabled: true
-        maskSpreadAtMin: 1
-        maskThresholdMin: 0.5
+    Colouriser {
+        source: root.mask
+        colorizationColor: Colours.palette.m3onPrimary
 
         x: 0
         y: -parent.offset