Fix JSON-LD schema params mapping

[timcappalli]

I noticed that the JSON-LD metadata was still showing the default image for image/logo after setting the value under [schema] in params.toml.

The if statement for the logo/image uses schemaType. All other references are .Site.Params.schema.type.

After changing to ...schema.type to match the others, the logo/image is correctly being updated with the value from params.

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[markdumay]

Thanks, @timcappalli, for spotting this and for the PR!