Describe the bug
When displaying a diff containing a multi-codepoint glyphs (like emoji with skin tones, for example) the horizontal padding is improperly calculated.

To Reproduce
Steps to reproduce the behavior:

1. Commit some file
2. Make a change that involves a line with a multi-codepoint glyph
3. View the diff in lazygit
4. See error

Expected behavior
The horizontal padding should be calculated correctly, even when displaying multi-codepoint glyphs

Screenshots
If applicable, add screenshots to help explain your problem.

Version info:
Lazygit version: commit=, build date=, build source=homebrew, version=0.36.0, os=darwin, arch=amd64, git version=2.37.1 (Apple Git-137.1)
Git version: git version 2.37.1 (Apple Git-137.1)

Additional context
Add any other context about the problem here.

Note: please try updating to the latest version or manually building the latest master to see if the issue still occurs.