Bug: Fix page blinking after login

[ADWasHere]

When using the header_auth_callback and another auth callback for login, the page starts to "blink" as soon as a user logged in. This is because header_auth_callback always gets called when routing to the root.

Fix: Now when a user is already authenticated, the header_auth_callback won't be called Issue: #2599

[constantinidan]

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[constantinidan]

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