Fix div zero panic from zero fb calculation (#35) #342
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📝 Summary
This PR resolves the issue found on stress test where if the FCU arrives at just nice target_time-leeway_time, time drift calculated will be zero. This results in during calculate_flashblocks operation, the number of flashblocks to be built to be equal to zero, causing a panic on subsequent gas limit calculation due to a div-zero error.
The PR fixes handling on calculating time drift to additionally check if time drift is > 0.
Context of the issue:

✅ I have completed the following steps:
make lintmake test