Make sure Firebase admin is initialized in getUserFromCookies

[juhanakristian]

Fixes #573

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[codecov[bot]]

Codecov Report

Base: 99.25% // Head: 99.25% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (2434ba5) compared to base (32465e0). Patch coverage: 100.00% of modified lines in pull request are covered.

:exclamation: Current head 2434ba5 differs from pull request most recent head 6cef0d3. Consider uploading reports for the commit 6cef0d3 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v1.x #610 +/- ## ======================================= Coverage 99.25% 99.25% ======================================= Files 30 30 Lines 672 673 +1 Branches 223 223 ======================================= + Hits 667 668 +1 Misses 5 5 ``` | [Impacted Files](https://codecov.io/gh/gladly-team/next-firebase-auth/pull/610?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gladly-team) | Coverage Δ | | |---|---|---| | [src/getUserFromCookies.js](https://codecov.io/gh/gladly-team/next-firebase-auth/pull/610?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gladly-team#diff-c3JjL2dldFVzZXJGcm9tQ29va2llcy5qcw==) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gladly-team). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=gladly-team)

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Name	Status	Preview	Comments	Updated
nfa-example	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Feb 16, 2023 at 4:40PM (UTC)

[kmjennison]

Looks great. Thanks for the contribution!