[openstreetmap/openstreetmap-website] Update MANUAL_INSTALL.md with integration test note (PR #7139)

[Simon Poole]

### Description

Add note about Firefox and WebGL requirement for integration tests.

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/7139

-- Commit Summary --

  * Update MANUAL_INSTALL.md with integration test note

-- File Changes --

    M doc/MANUAL_INSTALL.md (3)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/7139.patch
https://github.com/openstreetmap/openstreetmap-website/pull/7139.diff

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