fix: fix switch-cli problem using pnpm

[jackson-yyy]

fix #92

[antfu]

I kind forgot why I added unlink here, seem like to could just remove it

[jackson-yyy]

I kind forgot why I added unlink here, seem like to could just remove it

thanks for replying~

if use yarn/pnpm, it works perferctly.
but using pnpm, it seems to have a bug.

see #92 , i provided a demo to reproduce this bug.

After adding unlink here, it works normally with pnpm.