Validators can not increase commission after commission decrease.

[gkoumout]

Expected behavior

Validators are not allowed to increase the commission more than once per month. That means, if they increase their commission at some point, then they can not increase again for next 28 days.

On the other hand, if a validator has never increased their commission but has only decreased it (recall the initial commission value is 100%), then they should be able to increase it at any time by at most 5%.

Actual behavior

Even if a validator decreases the commission, Lisk Desktop app does not allow them to increase it afterwards.

Example: In devnet, validator "genesis_23" decreased their commission twice, first from 100% to 15% and then from 15% to 12%, as shown in the screenshots below.

Then, the validator should be allowed to increase their commission up to 17%. Instead, Lisk Desktop does not allow them to increase the commission as shown below.

Steps to reproduce

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

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