Fix deviation scale being shifted by 1/2 attribute bar width

[JakeWags]

Does this PR close any open issues?

Closes #386

Give a longer description of what this PR addresses and why it's needed

This PR fixes a deviation bar scale issue. The bar was scaled using dimensions.attribute.width / 2 when it needed to be dimensions.attribute.width. This was causing near 0 values to always go out to halfway to the maximum bar size.

Provide pictures/videos of the behavior before and after these changes (optional)

BEFORE:

AFTER:

note: The numbers only appear as part of the debugging process.

Have you added or updated relevant tests?

• [ ] Yes
• [ ] No changes are needed

Have you added or updated relevant documentation?

• [ ] Yes
• [ ] No changes are needed

Are there any additional TODOs before this PR is ready to go?

TODOs:

• [ ] ...

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