[w3c/manifest] Fix directive name in CSP figure (#714)

The figure shows `image-src` as a CSP directive, but it’s actually called `img-src`.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/714

-- Commit Summary --

  * Fix directive name in CSP figure

-- File Changes --

    M images/manifest-src-directive.svg (2)

-- Patch Links --

https://github.com/w3c/manifest/pull/714.patch
https://github.com/w3c/manifest/pull/714.diff

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https://github.com/w3c/manifest/pull/714