fix(@angular/pwa): additional public schematic definition

Author: codingnuclei

packages/angular/pwa/collection.json

@@ -6,6 +6,11 @@
       "schema": "./pwa/schema.json",
       "private": true,
       "hidden": true
+    },
+    "pwa": {
+      "factory": "./pwa",
+      "description": "Update an application with PWA defaults.",
+      "schema": "./pwa/schema.json"
     }
   }
 }