fix resolveClass bug

[xuwei-k]

Don't use List.unapplySeq for Iterable

Welcome to Scala 2.13.14 (OpenJDK 64-Bit Server VM, Java 11.0.23).
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scala> def f[A](a: Iterable[A]): String = a match {
     |   case Nil => "zero"
     |   case List(_) => "one"
     |   case _ => "many"
     | }
def f[A](a: Iterable[A]): String

scala> f(Nil)
val res0: String = zero

scala> f(List(3))
val res1: String = one

scala> f(Vector(3))
val res2: String = many