Merge bitcoindevkit/bdk#818: Fix wrong key origin path in public descriptor templates

d6e730f18ad25706323a3f3bc8e8646c002d1e1c Fix wrong key origin path in public descriptor templates (Yuki Kishimoto)

Pull request description:

  ### Description

  Fixes #817

  ### 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

  #### Bugfixes:

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

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Tree-SHA512: df08007b27d44a889cf94fe3e2c608cb92f963737c937ca952288d0468636308b09124f04b5dbd793de81d6cb06cf076c89358356abfe8417775ab1ab5650698