Fix a teeny-tiny typo in runner common/config.go

Sadra Barikbinrequested to merge
s.barikbin/gitlab-runner:patch-3 into main

Hi there!

What does this MR do?

Fixes a tiny typo

Why was this MR needed?

What's the best way to test this MR?

What are the relevant issue numbers?

Edited by Sadra Barikbin

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