refactor(recording): name Waybar icon

configs/nixos/modules/desktop/utilities/recording.nix

@@ -6,8 +6,7 @@
 }:
 # Keybound screen recording: pick a region, then toggle a video-only capture.
 let
-
-  glyph = code: builtins.fromJSON ''"\u${code}"'';
+  recordingIcon = builtins.fromJSON ''"\uf03d"'';
 
   # A single key both starts and stops.
   # A running wf-recorder is stopped with SIGINT so it finalises the file.
@@ -35,7 +34,7 @@ let
   # Empty text collapses the widget when idle, so it shows nothing until then.
   recordingStatus = pkgs.writeShellScript "waybar-recording-status" ''
     if ${lib.getExe' pkgs.procps "pgrep"} -x wf-recorder >/dev/null; then
-      printf '{"text":"${glyph "f03d"}","tooltip":"Recording","class":"recording"}\n'
+      printf '{"text":"${recordingIcon}","tooltip":"Recording","class":"recording"}\n'
     else
       printf '{"text":"","class":"idle"}\n'
     fi