Fix the login loop when signing in after configuring angular router.

[nipunsampath]

Purpose

Fixes #122

Approach

The reason for the login loop is that the AsgardeoSignInRedirectComponent contains a signIn()method call inside the ngOnInit() method in order to get signInWithRedirect() method working. However, when Asgardeo redirect user back to the signInRedirectURL after login in, this signIn() method will be called again since ngOnInit() executes on every initilization of AsgardeoSignInRedirectComponent.

An additional check has been added before calling signIn() to skip the method call if the ngOnInit() method has been called on a redirect to resolve the issue.