When genesis height is not zero, maxRemovalHeight returns 0

[shuse2]

Expected behavior

When genesis height is not zero, maxRemovalHeight should return genesis height.

aggregateCommint.height should be set to the genesis height because block at genesis height + 1 will have aggregateCommint.height == genesis height .

Actual behavior

https://github.com/LiskHQ/lisk-sdk/blob/v6.0.0-rc.1-1/framework/src/engine/generator/generator.ts#L217-L219
when genesis height is non zero, and if maxRemovalHeight is 0, the range of certificate generation will be (0, genesisHeight].
Although there BFTParam doesn't exist so the certificate will not be generated, the loop will be too big that the node won't be able to start

Steps to reproduce

Start a testnet node which uses 6.0.0-rc.1 with validator enabled

Which version(s) does this affect? (Environment, OS, etc...)

6.0.0-rc.1