Legacy config mode doesn't support short version name in .node-version

[sesm]

Steps to reproduce:

0. Enable legacy config mode
1. Put .node-version with content v20 at the root of the project
2. Run asdf current nodejs

Expected:

1. Latest installed 20.x.x is used for the project

Actual:

1. Not installed. Run "asdf install nodejs 20"

[augustobmoura]

Did you try configuring it?