[UWP] ColumnSet.SelectAction sample card is a bit flaky in the test app

[paulcam206]

I think maybe we just need to choose a better source for images... More than once I've had the card (v1.0/elements/ColumnSet.SelectAction.json) render incorrectly (missing images) in the test app. Works fine on rerun.

[RebeccaAnne]

@paulcam206 can you confirm that this repros with the latest test app (including automatic re-runs) and the latest test files updates (PR #3450)? Thanks!

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