Greg Spencer 0dea82e684
Remove unneeded expectation in test (#141822)
## Description

This removes an unneeded expectation in the test for the AppLifecycleListener.  It's unneeded because the test immediately resets the state anyhow.  I'm removing it because the web implementation sets the value when initializing, so it's never initially null there.

## Related PR
 - https://github.com/flutter/engine/pull/44720#issuecomment-1898482363
2024-01-22 19:46:10 +00:00
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