fix: No Permissions page vs. 404 page

[mapmeld]

Description

When I added a 404 page in #5045 , I accidentally blocked the NoPermissions page from showing up in that case. This moves the NoPermissions check to happen first. Should not block release.

Test Plan

Remove initial permissions ( oss_user ) from contexts/Store.tsx

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.
• If modifying /webui/react/src/shared/ verify make -C webui/react test-shared passes.

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