Update sample-tutorial-decomp-tree.md

[huiwenkong]

I don't see "Semantic models + dataflows" in my Power BI, so these images probably need updating.

[learn-build-service-prod]

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[Court72]

@maggiesMSFT

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

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