ES.87 (redundant == or !=) Fix dynamic_cast to Circle pointer
#2168
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The second ES.87 example seemed to mistakenly assume that `Circle` is pointer type, by the way it was using `dynamic_cast`. However, `Circle` is meant to be a class type instead. This fix is consistent with other examples, that also do `dynamic_cast<Circle*>`.
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The second ES.87 example seemed to mistakenly assume that
Circleis pointer type, by the way it was usingdynamic_cast. However,Circleis meant to be a class type instead. This fix is consistent with other examples, that also dodynamic_cast<Circle*>.