Menu applet: Don't use start-here icon

It's branded with the distribution logo in many icon themes.

Instead, ship the symbolic ourselves and refer to it.

linuxmint/mint21.1-beta#84

Author: clefebvre

data/icons/hicolor_categories_scalable_cinnamon-all-applications-symbolic.svg

@@ -2664,7 +2664,7 @@ class CinnamonMenuApplet extends Applet.TextIconApplet {
         this._applicationsButtons = [];
 
         if (!this._allAppsCategoryButton) {
-            this._allAppsCategoryButton = new CategoryButton(this, null, _("All Applications"), "start-here", true);
+            this._allAppsCategoryButton = new CategoryButton(this, null, _("All Applications"), "cinnamon-all-applications", true);
             this.categoriesBox.add_actor(this._allAppsCategoryButton.actor);
             this._categoryButtons.push(this._allAppsCategoryButton);
         }