Vim: vim.cursorStylePerMode is being ignored

[yujinyuz]

Describe the bug
In my settings.json I have these settings enabled:

"vim.cursorStylePerMode.insert": "underline",
"vim.cursorStylePerMode.normal": "underline",

To Reproduce
Steps to reproduce the behavior:

1. Copy the settings and see that it's not working

Expected behavior
Should respect the settings.json file

Screenshots
If applicable, add screenshots to help explain your problem.
If remapping-related, please attach log output: https://github.com/VSCodeVim/Vim#debugging-remappings.

Environment (please complete the following information):

• Extension (VsCodeVim) version: 1.12.2
• VSCode version: 1.40.2
• OS: macOS

Additional context

It's working with 1.11.3 version

[cvaldev]

I found the source of this bug, It's being caused by configuration.getCursorStyleForMode() always returning undefined. I could send in a PR with a fix for it.