5611c9e42adb4106f48039e19ab0797b266c7fff fix(file_store): rm lifetime from `FileError` (志宇)
Pull request description:
### Description
The lifetime on the error needed to be the same as the input magic bytes which was annoying.
### Changelog notice
Fixed
* Remove `bdk_file_store::FileError` lifetime.
### 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
ACKs for top commit:
LLFourn:
ACK 5611c9e42adb4106f48039e19ab0797b266c7fff
Tree-SHA512: 0eca5128c71c9adb10a712d169a2170b8cbb91678f93986957e86b26dbfed3ab19217a136b57328249a13a51cc06e6c424d58683d74a0fa3d29c22af04a95591
6a03e0f209