Cobbled Deepslate and Polished Deepslate are in the wrong group

Cobbled Deepslate and Polished Deepslate are grouped within "Decorative Stone", which is inconsistent with other similar blocks.

Cobbled Deepslate should not be within any group, and the Polished Deepslate should be grouped with the other polished stone types (Ideally, all polished stone types should be in "Decorative Stone" too).