fix(math): incorrect .Size() value

[julienrbrt]

Description

ref https://github.com/cosmos/cosmos-sdk/actions/runs/5924703145/attempts/1?pr=17482 #17482

/home/julien/projects/cosmos/cosmos-sdk/tests/integration/staking/keeper/delegation_test.go:71: assertion failed: error is not nil: math/big: cannot unmarshal "9999999999999999999\x00" into a *big.Int

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[julienrbrt]

This should be improved in a follow-up. What is pressing now is to release a v1.1.2 of math that does not break.

[julienrbrt]

Closing this as we have reverted the implementation. As discussed in our meeting, we should try to re-include #16263 / #17480 with fixes for this. cc @elias-orijtech