cli: Fix toolchain solana_version override log

[acheroncrypto]

Problem

solana_version override logs incorrectly when the restoration post-command fails.

Summary of changes

Check whether the command to override solana_version succeeded or not instead of only checking whether the command ran.

[vercel]

@acheroncrypto is attempting to deploy a commit to the coral-xyz Team on Vercel.

A member of the Team first needs to authorize it.