8176501: Method Shape.getBounds2D() incorrectly includes Bezier control points in bounding box

Fixing unit test failures introduced with b3e84a5e .

(The likely explanation for why this went unaddressed previously is: I probably didn't correctly execute unit tests after this change. A less likely explanation might be: the Path2D/UnitTest class uses random numbers each session, so it's possible results passed in that session and failed in others.)