Cannot set tenantId back to default tenant by passing null

[stee1ix]

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What feature would you like to see?

Would really like the setTenantId function to be able to receive null

How would you use it?

I have different login methods based on the tenant. So setting it to something works fine but going back to default tenant is not possible.

[Rexios80]

This is a duplicate of https://github.com/firebase/firebase-android-sdk/issues/3398, but I'm totally fine with bumping this again it's taken way too long to implement the simple fix for this