firmware: tests: sleep 50ms when creating fake hooks
firmware: tests: sleep 50ms when creating fake hooks

This is needed because the filesystem may report it is complete and as
all tests run in parallel, we eventually get "Text is busy".

Signed-off-by: Otavio Salvador <1d31b11c1b92bf5d043d36edfe7174db39a6b891@ossystems.com.br>

UpdateHub/updatehub