Violin plots are note coloring correctly

[brittsikora]

Bug reported by Kristen on 7/12:

"2. Violin plots in the ‘Results Over Time’ figure are not coloring correctly when you select by group display (all categories are grey)."

[brittsikora]

Issue cannot be replicated in project 273

[samussiah]

Test notes:

• The colors of the violin plots match the colors of the box plots.

[dschwentker]

Tested and confirmed that the violin plots have color that match the box plot colors when you add a Group filter such as {"groups":["SEX","RACE"]}. Passed in all browsers.