e9bbb8724f92ada33228bbfc22acdaefbd79c44e Fix wallet export rescan height (LLFourn)
Pull request description:
It would return the latest transaction height rather than the earliest as the height to rescan from.
Found by @evanlinjin and I while implementing `bdk_core` stuff into bdk's wallet.
### Changelog notice
- Fix wallet export transaction height
#### All Submissions:
* [x] I've signed all my commits
* [x] This pull request breaks the existing API
* [x] I've added tests to reproduce the issue which are now passing
ACKs for top commit:
rajarshimaitra:
tACK e9bbb8724f92ada33228bbfc22acdaefbd79c44e
notmandatory:
ACK e9bbb8724f92ada33228bbfc22acdaefbd79c44e
Tree-SHA512: 9b29ef0df39d26806f48b38fa5c3643bad32f58b993ffdcfc7811aca64a025bd8f163967321f874aa2ef3d29c3e7bc6e2f44d348306a37111f4def036d4c095e