[breaking-change] Fix arg for calculating state root

[avalonche]

📝 Summary

op-rbuilder node --flashblocks.calculate-state-root=false
error: unexpected value 'false' for '--flashblocks.calculate-state-root' found; no more were expected

Usage: op-rbuilder node --flashblocks.calculate-state-root

default for boolean flags should be false, otherwise clap does not recognise true / false passed into the arg

updates the cli flag from --flashblocks.calculate-state-root to --flashblocks.disable-calculate-state-root and the corresponding env flag.

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✅ I have completed the following steps:

• Run make lint
• Run make test
• Added tests (if applicable)