Remove shortcut icons to fix ApplicationIconCompiler null error in prod

The bundle crashes on shortcut->icons being null when icons lack sizes in prod env.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

config/packages/pwa.yaml

@@ -32,26 +32,18 @@ pwa:
               short_name: Events
               url: /evenements
               description: Voir tous les evenements
-              icons:
-                  - src: '%kernel.project_dir%/public/favicon.png'
             - name: Organisateurs
               short_name: Orgas
               url: /organisateurs
               description: Decouvrir les organisateurs
-              icons:
-                  - src: '%kernel.project_dir%/public/favicon.png'
             - name: Mon compte
               short_name: Compte
               url: /mon-compte
               description: Acceder a mon espace
-              icons:
-                  - src: '%kernel.project_dir%/public/favicon.png'
             - name: Contact
               short_name: Contact
               url: /contact
               description: Nous contacter
-              icons:
-                  - src: '%kernel.project_dir%/public/favicon.png'
     serviceworker:
         enabled: true
         src: '%kernel.project_dir%/public/sw.js'