[ Bug ] lv_arc with rounded-ending

When drawing by lv_arc width rounded-ending style.
Occurs a little things as the following picture.



It’s a known issue: https://github.com/littlevgl/lvgl/pull/1228

This doesn’t currently play too nice with style.line.rounded = 1 (see demo). I haven’t changed how the rounded end caps are drawn - the issue with the line cap end drawing code is just more obvious when you have properly anti-aliased curves.

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