Fix logic for setting IGNORE_SSH_TESTS

[owtaylor]

The logic for checking for dependabot introduced in
fda4cc8 skip ssh on dependabot PRs
was somewhat confused; this was partially fixed in
98739c6 fix ignore api key tests

This makes the logic for IGNORE_SSH_TESTS match that for IGNORE_API_KEY_TESTS and
be a proper logic opposite of:

if: ${{ github.event.pull_request.head.repo.fork == false && github.actor != 'dependabot[bot]' }} 

[netlify]

✅ Deploy Preview for continuedev canceled.

Name	Link
🔨 Latest commit	7e0b3d9
🔍 Latest deploy log	https://app.netlify.com/sites/continuedev/deploys/67cd6ea71fe5870008cb1a37