a42e9df06f fix: createwallet to require 'load_on_startup' for descriptor wallets (Konstantin Akimov)
Pull request description:
## Issue being fixed or feature implemented
RPC `createwallet` has changed list of arguments: `createwallet "wallet_name" ( disable_private_keys blank "passphrase" avoid_reuse descriptors load_on_startup )` since https://github.com/dashpay/dash/pull/5965
`load_on_startup` used to be an argument 5 but now it has a number 6. Both arguments 5 and 6 are boolean and it can confuse an user: they may even not notice that something wrong when it meant to be "load on startup" but got "descriptor wallet" which is not expected.
See also previous attempt to resolve issue: https://github.com/dashpay/dash/pull/6029
## What was done?
To prevent confusion if user is not aware about this breaking changes, the RPC createwallet throws an exception if user trying to create descriptor wallet but has not mentioned load_on_startup. This requirement can be removed when major amount of users updated to v21.
## How Has This Been Tested?
Run unit/functional tests
Tested with CLI:
```
$ createwallet "tmp-create" true true "" false true
RPC createwallet would not accept creating descriptor wallets without specifying 'load_on_startup' flag. It is required explicitly in v21 due to breaking changes in createwallet RPC (code -8)
$ createwallet "tmp-create" true true "" false true true
{
"name": "tmp-create",
"warning": "Empty string given as passphrase, wallet will not be encrypted.\nWallet is an experimental descriptor wallet"
}
```
## Breaking Changes
You can't more pass 'descriptor=NN' without https://github.com/dashpay/dash/pull/5965 which has not been released yet.
## Checklist:
- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] I have added or updated relevant unit/integration/functional/e2e tests
- [ ] I have made corresponding changes to the documentation
- [x] I have assigned this pull request to a milestone
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