win32: Fix a flaky test Test_terminal_shell_option #6557
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Cygwin/MSYS2 provides dir.exe, and if it existed in the %PATH%,
"term dir" succeeded unintentionally. That can make the test flaky.
Use dir.com instead of dir to fix this.
"term dir.com" should fail. (Assuming dir.com doesn't exist.)
"term ++shell dir.com" should execute the dir builtin command even with
the extension ".com".