WidgetBlueprint::DrawLines has broken AA on sharp cornered lines

WidgetBlueprintLibrary::DrawLines which calls FSlateDrawElement::MakeLines has broken AA for sharp cornered lines.

Draw an anti-aliased line with a sharp change in direction using WidgetBlueprint::DrawLines. Here's one way to rig it:

New Widget Blueprint
Override OnPaint event as follows:

OnPaint -> Draw Lines -> return
Where Draw Lines takes an array of
[0]200,100; [1]300,500; [2]320,100

Add new widget to level UI graph
Event BeginPlay -> Create widget -> Add to viewport

Fix UE-51650

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