Merge bitcoindevkit/bdk#600: Change wallet::get_funded_wallet to return Wallet<AnyDat...

e7a56a92685ce1948d2ec7232fccd7e072d4abb3 Change wallet::get_funded_wallet to return Wallet<AnyDatabase> (Steve Myers)

Pull request description:

  ### Description

  Change testing function `wallet::get_funded_wallet` to return `Wallet<AnyDatabase>` instead of `Wallet<MemoryDatabase>`. This will allow us to use this function for testing `bdk-ffi` which only works with `Wallet<AnyDatabase>`.

  ### Notes to the reviewers

  This is required to complete https://github.com/bitcoindevkit/bdk-ffi/pull/148.

  ### Checklists

  #### All Submissions:

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

  #### New Features:

  * [ ] I've added tests for the new feature
  * [ ] I've added docs for the new feature
  * [ ] I've updated `CHANGELOG.md`

  #### Bugfixes:

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

ACKs for top commit:
  afilini:
    ACK e7a56a92685ce1948d2ec7232fccd7e072d4abb3

Tree-SHA512: 47b53ab6dcee63fc7b24666d3cf9a0ad832782081dd2fe92961c8c9b4c302df90db96b0b518af71d6cbc85319434971219100f8cedb35ce7212d944db29a4295