Fix application_settings JOIN condition for CiBuildsProbe

Ahmad Sherifrequested to merge
fix-join-condition-for-ci-probe into master

After gitlab-org/gitlab!29981 (merged), we cannot assume an application_settings with ID=1 exists. But we know that there will only be one record in that table, so we can change the JOIN condition to TRUE safely.

Fixes #71 (closed)

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