fix: respect filtered elements when determining selected

[bashmish]

Turned out there was a bug and filtered elements were not respected in getElementData, resulting in a first element in the original manifest to take priority over the first in the filtered array.

This PR should fix that.

PS: I tested this behavior in #153, but maybe not correctly prepared the build and tested partially old code. I thought yarn fixtures, yarn build and then yarn start was a way to go, also tried to keep yarn dev and yarn start running side by side, but smth went wrong apparently resulting in this bug unnoticed. Maybe it's good to document in Contribution Guidelines how to properly work in a dev mode and always serve new version of the lib in the Rocket site.

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[bashmish]

@web-padawan no worries, I had a small workaround on my side. Thanks for taking this in now 👍