Added condition to hide donut total label if hideLabel flag is set per issue #4370

[halfpeeled]

New Pull Request

Summary of changes:

Added a condition to Pie.js so that donut chart total labels can display the total number without the label if desired. This is set by the flag hideLabel which can be passed as an option to the plotOptions.pie.donut.labels.total. This was motivated by this issue requesting the feature. I was not sure how to go about adding an additional test for this small change, but all existing tests still passed.

Fixes # 4370

Type of change

• [X] New feature (non-breaking change which adds functionality)

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] My changes generate no new warnings