fix: use initLoginFlow for code flow

jeroenheijmans#32

Author: maxisam

src/app/core/auth.service.ts

@@ -176,7 +176,7 @@ export class AuthService {
   }
 
   public login(targetUrl?: string) {
-    this.oauthService.initImplicitFlow(encodeURIComponent(targetUrl || this.router.url));
+    this.oauthService.initLoginFlow(encodeURIComponent(targetUrl || this.router.url));
   }
 
   public logout() { this.oauthService.logOut(); }