Unnecessary horizontal scrollbar is shown in case logwidthmarker is set

What steps will reproduce the problem?

set tgit.logwidthmarker = 72 in .gitconfig

What is the expected output? What do you see instead?

In commit dialog horizontal scrollbar is shown as needed. Now scrollbar is shown every time. This is due to scintilla has default window width 2000px.

What version of TortoiseGit and Git are you using? On what operating system?

TGit 1.8.16.0

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