Bump mtui from 6c07b11 to 2645355

Bumps [mtui](https://github.com/minetest-go/mtui_mod) from `6c07b11` to `2645355`.
- [Commits](minetest-go/mtui_mod@6c07b11...2645355)

---
updated-dependencies:
- dependency-name: mtui
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>