fix(auth-guard): Address zone issues on lazy loaded routes (#2368)

Fix auth guard timing to not cause issues with change detection and other issues on lazy loaded routes.

Author: J Humes

src/auth-guard/auth-guard.ts

@@ -24,6 +24,7 @@ export class AngularFireAuthGuard implements CanActivate {
     const auth = of(undefined).pipe(
       observeOn(new ɵAngularFireSchedulers(zone).outsideAngular),
       switchMap(() => zone.runOutsideAngular(() => import('firebase/auth'))),
+      observeOn(new ɵAngularFireSchedulers(zone).insideAngular),
       map(() => ɵfirebaseAppFactory(options, zone, nameOrConfig)),
       map(app => app.auth()),
       shareReplay({ bufferSize: 1, refCount: false }),
@@ -56,4 +57,4 @@ export const emailVerified: AuthPipe = map(user => !!user && user.emailVerified)
 export const customClaims = pipe(idTokenResult, map(idTokenResult => idTokenResult ? idTokenResult.claims : []));
 export const hasCustomClaim = (claim:string) => pipe(customClaims, map(claims =>  claims.hasOwnProperty(claim)));
 export const redirectUnauthorizedTo = (redirect: any[]) => pipe(loggedIn, map(loggedIn => loggedIn || redirect));
-export const redirectLoggedInTo = (redirect: any[]) =>  pipe(loggedIn, map(loggedIn => loggedIn && redirect || true));
+export const redirectLoggedInTo = (redirect: any[]) =>  pipe(loggedIn, map(loggedIn => loggedIn && redirect || true));