[Eww] Clean up shell scripts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

home-manager/features/eww/config/scripts/workspaces.sh

@@ -12,8 +12,8 @@ handle_event() {
 }
 
 list_workspaces() {
-  focused=`hyprctl activeworkspace -j | jq '.id'`
-  active=`hyprctl monitors -j | jq 'map(select(.name == "'$monitor'")) | .[0].activeWorkspace.id'`
+  focused=$(hyprctl activeworkspace -j | jq '.id')
+  active=$(hyprctl monitors -j | jq 'map(select(.name == "'$monitor'")) | .[0].activeWorkspace.id')
   # Explanation
   # 1. Select only workspaces on the current monitor.
   # 2. Remove duplicates (might be a bug with split-monitor-workspaces