fix(rendering): Aliasing in rounded borders

[bryphe]

Issue:

When using rounded borders, even though we set the anti-alias property on the border paint object, we can still end up with jagged edges:

Defect:

The inner-rounded rectangle wasn't getting anti-aliasing applied, so jagged edges could still sneak through.

Fix:

Set anti-alias on the view node paint as well - this smooths out the edge, which is visually superior:

[bryphe]

/azp run

[azure-pipelines[bot]]

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