log.showSignature causes reword dialog to spill gpg info into the commit message

[squeaktoy]

Describe the bug
If you enable log.showSignature in .gitconfig, lazygit will spill some of the gpg signing info from the commit log into the reword dialog.

To Reproduce
Steps to reproduce the behavior:

1. Edit and append the following to $HOME/.gitconfig:

[log]
	showSignature = true

2. Open lazygit in some repo with signed commits
3. Select a signed commit, and press r to reword
4. Observe how the gpg information gets spilled into the commit message

Expected behavior
The gpg information does not get spilled into the reword dialog.

Screenshots

Version info:
commit=, build date=, build source=unknown, version=0.41.0, os=linux, arch=amd64, git version=2.43.2
git version 2.43.2

[stefanhaller]

Duplicate of #3425; already fixed by #3431.