fix(fancy-bar): improve shadow rendering

When a niri output was configured with larger scale values (e.g. 2), the
shadow underneath the bar was rendered with visible gradient steps.
Setting the `blurMultiplier` to 1 fixes this. The slightly higher
opacity makes it a bit more prominent when the scale is 1.

Author: imiric

fancy-bar/modules/bar/Bar.qml

@@ -38,8 +38,8 @@ Item {
                 shadowVerticalOffset: root.position === Types.Position.Top ? 5 : -5
                 shadowHorizontalOffset: -20
                 shadowBlur: 1
-                blurMultiplier: 1.5
-                shadowColor: "#C0000000"
+                blurMultiplier: 1
+                shadowColor: "#D0000000"
             }
         }
     }