[regression] order of colors in clustered columns plot changed from 1.7 to 1.8

[cjolif]

see:

​http://dojo-toolkit.33424.n3.nabble.com/dojox-charting-clustered-Column-bar-color-disordered-td3991411.html

This might be related to #15308

[cjolif]

See also: #15359

This behavior was indeed introduced by #15308 for ClusteredCoumns?. However it was there for a long time for other types of plots including Columns.

[cjolif]

Thinking more about it I don't think we want to "fix" that one separately. All other plots are using the color in that order. The clustered columns were _the_ exception. They now all do the same as all other plots which is consistent. As stated in #15359, that order is not very good, but if we change it, we need to change it for all plots not just clustered columns to keep the consistency. So I think we will wait for the full solution in #15359 do fix this. Meanwhile apply a workaround which is to reverse the order of colors in your theme.