fix(@angular-devkit/build-angular): remove unused option from schema

Related to angular/devkit#858

Author: filipesilva

packages/angular_devkit/build_angular/src/dev-server/schema.json

@@ -110,10 +110,6 @@
       "type": "string",
       "description": "URL where files will be deployed."
     },
-    "verbose": {
-      "type": "boolean",
-      "description": "Adds more details to output logging."
-    },
     "progress": {
       "type": "boolean",
       "description": "Log progress to the console while building."