fix(rum-explorer): conversion specs should operate on facets, not on raw properties

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* [b936d6a](https://github.com/adobe/helix-website/commit/b936d6aa2b932d9786ded0a38126d6d315ad4146) :white_check_mark: (latest) * [b567cc5](https://github.com/adobe/helix-website/commit/b567cc5e775d08d88867e13ee88a71d032312cb5) :white_check_mark: * [b05d30c](https://github.com/adobe/helix-website/commit/b05d30ce554ff1e9550ae621e585bcb8651f42df) :white_check_mark: