modify cmd command

[pping]

set up a startup script](https://superuser.com/a/144348) and append the following line does not work :

FOR /f "tokens=*" %i IN ('fnm env --use-on-cd') DO CALL %i
After my testing, this will cause a endless loop, causing the cmd to not function properly.

add follwing command:
::autorun.cmd
fnm env > %USERPROFILE%/fnm.txt
for /f "delims=" %%a in (%USERPROFILE%/fnm.txt) do (
call %%a
)
del %USERPROFILE%/fnm.txt

[changeset-bot]

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Latest commit: cf5b6a2

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[Schniz]

I don't understand this, so I'm closing. Feel free to reopen a PR with a test or a video shows a reproduction please 🙏