Update rubocop AvoidCreate exclusion

What does this MR do and why?

In !121163 (merged), spec/views/projects/issues/_issue.html.haml_spec.rb was moved to spec/views/projects/issues/service_desk/_issue.html.haml_spec.rb. However, in the MR we forgot to update .rubocop_todo/rspec/factory_bot/avoid_create.yml with the new path, which is what we're fixing in this new MR.

Resolves #412333 (closed)

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