List notes UI screen fixes

Fixed:

- [x] Window border erasing
- [x] Windows header erasing
- [x] Notes clearing will erase full width, not half.
- [x] Some action text changed. Was: "< Go back > More" Now: "< Prev notes Next notes >"
- [x] Length calculation based on utf8_width()
- [x] Fix window size in even screen height.