Coloring dimension picker does not update dimension names for coloring point dataset

[sbvis]

Coloring dimension picker action does not change dimension names for coloring dataset even after
triggering notifyDatasetDataDimensionsChanged and notifyDatasetDataChanged for that dataset

[sbvis]

Added a fix for this issue in the Scatterplot plugin that we were facing in the ATAC viewer

[alxvth]

Was this fixed by #187?