In visual mode, the cursor was displayed incorrectly when it was at the end of a line.

Describe the bug

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
At the end of the line it should appear as a square, but the head appears as a vertical bar.

Screenshots

Environment (please complete the following information):

Extension Author (truncated) Version
vscode-nginx-conf ahm 0.1.3
Bookmarks ale 13.2.4
doxdocgen csc 1.4.0
arm dan 1.7.4
code-runner for 0.11.7
vscode-pull-request-github Git 0.42.0
markdown-image han 1.1.20
vue-snippets hol 1.0.4
vscode-peacock joh 4.0.1
volar joh 0.34.11
vscode-typescript-vue-plugin joh 0.34.11
inifmt lkr 0.1.4
cortex-debug mar 1.4.4
git-graph mhu 1.30.0
vscode-language-pack-zh-hans MS- 1.67.2
cmake-tools ms- 1.10.5
cpptools ms- 1.9.8
cpptools-extension-pack ms- 1.2.0
makefile-tools ms- 0.5.0
vsliveshare ms- 1.0.5527
vsliveshare-audio ms- 0.1.91
vsliveshare-pack ms- 0.4.0
material-icon-theme PKi 4.17.0
platformio-ide pla 2.4.3
vscode-yaml red 1.7.0
sass-indented syl 1.8.19
cmake twx 0.0.17
vscode-terminal-here Tyr 0.2.4
vim vsc 1.22.2
JavaScriptSnippets xab 1.8.0
material-theme zhu 3.13.24
linkerscript Zix 1.0.2
(2 theme extensions excluded)

Additional context
Add any other context about the problem here.

Start by reproducing the cursor appearance problem in VSCodeVim's visual mode at the end of a line, using the behavior and screenshots described in this issue. No source files or tests are named, so locate the visual-mode cursor handling and its tests first; done means the cursor appears as a square at line endings without regressing other visual-mode positions.