Fix variable scope of context boolean

[maxgds]

In #2238 we added the word overview to format titles where an attachment shared the name of the page. The intent was for this to appear inside the H1, using the context_inside parameter. Unfortunately a refactor after review meant that the variable was scoped too tightly and never available to the component call. This resolves that by initially setting the variable outside of the each loop, and adds extra testing to ensure it is there when necessary.

Sample affected url: https://www.gov.uk/government/consultations/call-for-evidence-to-inform-orbital-liability-and-insurance-policy

Before:

After:

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[jon-kirwan]

Yep, works fine for me. Double checked against the original list of sample addresses in #2238 and all ok there too. 👍