prompt: update powerlevel10k submodule to v1.10.0
prompt: update powerlevel10k submodule to v1.10.0

Release notes:

- https://github.com/romkatv/powerlevel10k/releases/tag/v1.8.0
- https://github.com/romkatv/powerlevel10k/releases/tag/v1.8.1
- https://github.com/romkatv/powerlevel10k/releases/tag/v1.8.2
- https://github.com/romkatv/powerlevel10k/releases/tag/v1.9.0
- https://github.com/romkatv/powerlevel10k/releases/tag/v1.9.1
- https://github.com/romkatv/powerlevel10k/releases/tag/v1.10.0

hghwng/prezto