fix(app): Show 404 pages on more invalid route paths (root and error pages)

[nellh]

Fixes a bug where sometimes the 404 page would not be displayed for an invalid path when it matched part of a valid path.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 42.48%. Comparing base (29e4511) to head (24b61c5).
Report is 2 commits behind head on master.

Files	Patch %	Lines
...es/openneuro-app/src/scripts/errors/errorRoute.jsx	0.00%	14 Missing ⚠️
packages/openneuro-app/src/scripts/routes.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3061   +/-   ##
=======================================
  Coverage   42.48%   42.48%           
=======================================
  Files         601      601           
  Lines       37986    37986           
  Branches     1113     1113           
=======================================
  Hits        16138    16138           
  Misses      21632    21632           
  Partials      216      216           

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