Remove .data that was being deprecated

[twicki]

Description
With the deprecation of .data of Quantities in NDSL Release 07, we remove the last use-cases here.

How Has This Been Tested?
Nothing changes, so as long as the CI is happy, so are we.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included