elements-qt asserts when looking at some transaction details

```
liquid-qt: wallet/wallet.cpp:1268: CAmountMap CWallet::GetCredit(const CTxOut&, const isminefilter&) const: Assertion `false && “CWallet::GetCredit(const CTxOut&, const isminefilter&): this method should not be used anymore”‘ failed.
Aborted (core dumped)
```

These functions are unused in -cli, but are used in -qt and were previously simply disabled with an assert.