Buffer-tag PowerShell regex matches a literal pipe

[rdslw]

The new buffer-tag PowerShell branch never matches normal shell names:

:echo 'pwsh.exe' =~? '\vpowershell\|pwsh'
" 0
:echo 'pwsh.exe' =~? '\vpowershell|pwsh'
" 1

With \v, \| is a literal pipe. Line 170 should use '\vpowershell|pwsh', as the UserCmd check already does. Verified on Vim 9.2.1119.