Merge bitcoindevkit/bdk-cli#256: fix(test): Enable using any client in config test

af0d98e16f8fc6d8e9bdf431d0d39e23b5d51d6a fix(test): Enable any client type in config test (Vihiga Tyonum)

Pull request description:

  ### Description

  As pointed out in issue #255, whenever Esplora was configured out, the config test will fail because Esplora was used as the client.

  This fix addresses the above issue by adding other client types in the test.

  <!-- You can erase any parts of this template not applicable to your Pull Request. -->

  Fixes #255

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk-cli/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing

  #### Bugfixes:

  * [ ] This pull request breaks the existing API
  * [x] I've added tests to reproduce the issue which are now passing
  * [x] I'm linking the issue being fixed by this PR

ACKs for top commit:
  notmandatory:
    cACK af0d98e16f8fc6d8e9bdf431d0d39e23b5d51d6a

Tree-SHA512: f1eecabd0d1dc9fc6e005655ffd158d5ed1e1021156ae2ce96195f78fcab35a13380269dd019157da34a8cd28308525d3ef4e1b08a0b6dec2e217a5782052f02