[vim] Fix argument escaping for Windows batch file

Fix #3620

CHANGELOG.md

@@ -27,6 +27,7 @@ CHANGELOG
     - `change-multi(0)` - disable multi-select mode
 - `become` action is now supported on Windows
     - Unlike in *nix, this does not use `execve(2)`. Instead it spawns a new process and waits for it to finish, so the exact behavior may differ.
+- Fixed argument escaping for Windows cmd.exe
 - Bug fixes and improvements
 
 0.50.0