Fix snooz tests

[emontnemery]

Proposed change

Fix snooz tests to unload + setup config entry instead of loading a duplicate config entry

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[home-assistant]

Hey there @AustinBrunkhorst, mind taking a look at this pull request as it has been labeled with an integration (snooz) you are listed as a code owner for? Thanks!

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[emontnemery]

Tests are failing, it seems snooz config entries can't be unloaded, at least not in tests