Remove skipped rounds guard

[0xCardiE]

In the redistribution contract, there is a check if at least the last $i\ge \Delta d$ rounds has been skipped if the depth decreased by $\Delta d$:

$$ \Delta d := depth_{last}-depth_{curr} $$

$$ 0<\Delta d \Rightarrow \Delta d\le round_{curr}-round_{last} $$

This condition was put in there to mitigate the singleton-node zero-depth attack. But now after phase 3 (attach r8 proofs to the claim) of storage incentives, this criteria just creates unnecessary price increase and a pain for operators when there
is a radius decrease. Thus the check needs to be removed.

[0xCardiE]

Worked on here
#301