Fix swaync notification icon size in waybar

Remove explicit 16pt Pango span wrapper so the icon inherits
the default waybar font size, matching all other modules.

defaults/xdg/waybar/config

@@ -204,7 +204,7 @@
     },
     "custom/notification": {
         "tooltip": true,
-        "format": "<span size='16pt'>{icon}</span>",
+        "format": "{icon}",
         "format-icons": {
             "notification": "󱅫",
             "none": "󰂜",