fix LicenseDetection.apply

[xuwei-k]

Don't use ::.unapply method for Seq

Welcome to Scala 2.12.20 (OpenJDK 64-Bit Server VM, Java 21.0.8).
Type in expressions for evaluation. Or try :help.

scala> def seq1: Seq[Int] = List(2)
seq1: Seq[Int]

scala> seq1 match {
     |   case x :: Nil => "single"
     |   case _ => "other"
     | }
res0: String = single

scala> def seq2: Seq[Int] = Vector(2)
seq2: Seq[Int]

scala> seq2 match {
     |   case x :: Nil => "single"
     |   case _ => "other"
     | }
res1: String = other