Issueasset tx with blind parameter false is not accepted after the change for more than 21M

[Mixa84]

Discovered this issue while merging recent RC changes on Sequentia, concretely 23.3.0 RC2 (#1338) . Our issueasset is by default unblinded and wallet_elements_21million.py was failing. While debugging the issue I've found that MoneyRange() check in confidential_validation.cpp wasn't adapted to do it only for policy asset but this check is done only in case that amount is explicit, so the transaction was rejected on broadcast.

@delta1 @psgreco

[delta1]

Hi @Mixa84 thank you for reporting this, slightly simpler implementation against master here: #1445

[Mixa84]

Thanks, I didn't want to import a new header and use a static Params object in confidental_validation.cpp, but yeah this is quite simpler.