Stacked column totals dataLabel position fix (category X-axis).

[rosco54]

Fixes #4474

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [X] My changes generate no new warnings
• [X] New and existing unit tests pass locally with my changes

[e-karlsson]

@junedchhipa : When will this be released?