Fix action failing because it doesn't read the correct error

[CloudNStoyan]

Currently when there is already a PR created and the action is ran the following error occurs:

Run tgymnich/fork-sync@v2.0
/home/runner/work/_actions/tgymnich/fork-sync/v2.0/lib/main.js:85
            console.log(error.errors[0].message);
                                    ^

TypeError: Cannot read properties of undefined (reading '0')
    at run (/home/runner/work/_actions/tgymnich/fork-sync/v2.0/lib/main.js:85:37)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

Node.js v20.13.1

The problem was this line:

fork-sync/src/main.ts

Line 63 in 24694a3

console.log(error.errors[0].message);

Which tries to get the error from the wrong place, which I fixed by just copying the above IF statement's way of extracting the error message

I tested it on my repo and now the action doesn't fail when the PR is already created