Preserve order of breakdowns in bar_dist

[johangarzon]

Superset version:

0.22.1

Expected results

Preserve order of breakdowns in bar_dist

Actual results

Order of breakdown in bar_dist is given by sum of group total

Based on this edit, what happened to this edit, it seems the column behavior was set back to the old version.
The issue with the way columns are currently ordered is the lack of flexibility.

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