fix(@schematics/angular): use proper variable in resolver functional spec

Author: cexbrayat

packages/schematics/angular/resolver/functional-files/__name@dasherize__.resolver.spec.ts.template

@@ -12,6 +12,6 @@ describe('<%= camelize(name) %>Resolver', () => {
   });
 
   it('should be created', () => {
-    expect(resolver).toBeTruthy();
+    expect(executeResolver).toBeTruthy();
   });
 });