Add overflow in header if minihero not present

[SaptakS]

Description

The navbar dropdown problem was persistent in error page. Hopefully fixed that

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

Testing

Couldn't test error page locally. @mbeacom can you help?

Refers/Fixes

[codecov]

Codecov Report

Merging #2080 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2080   +/-   ##
=======================================
  Coverage   27.94%   27.94%           
=======================================
  Files         133      133           
  Lines       10941    10941           
  Branches     1471     1471           
=======================================
  Hits         3057     3057           
  Misses       7775     7775           
  Partials      109      109

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[thelostone-mc]

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