Inconsistent use of `check_wallet_descriptor`

[ValuedMammal]

After #1533 we fail to call check_wallet_descriptor in all arms of a match block during load, but this was correct in v1.0.0-beta.1. Also, we apparently never apply the check during new wallet creation.

bdk/crates/wallet/src/wallet/mod.rs

Lines 585 to 595 in 76aec62

	// parameters must match
	Some(make_desc) => {
	let (exp_desc, keymap) =
	make_desc(&secp, network).map_err(LoadError::Descriptor)?;
	if desc.descriptor_id() != exp_desc.descriptor_id() {
	return Err(LoadError::Mismatch(LoadMismatch::Descriptor {
	keychain: KeychainKind::Internal,
	loaded: Some(desc),
	expected: Some(exp_desc),
	}));
	}