[scala-akka-http-server] Fix array optional parameter invalid default value

[krrrr38]

see #10675

• ASIS

> ./mvnw clean install
> java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate \
  -g scala-akka-http-server \
  -i petstore-optional-array-parameter.yaml \
  -o /var/tmp/scala-akka-http-server
> grep findByStatus -A4 /var/tmp/scala-akka-http-server/src/main/scala/org/openapitools/server/api/PetApi.scala
    path("pet" / "findByStatus") {
      get {
        parameters("status".as[String].?("new ListBuffer[String]() ")) { (status) =>
            petService.findPetsByStatus(status = status)
        }

• TOBE

> ./mvnw clean install
> java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate \
  -g scala-akka-http-server \
  -i petstore-optional-array-parameter.yaml \
  -o /var/tmp/scala-akka-http-server
> grep findByStatus -A4 /var/tmp/scala-akka-http-server/src/main/scala/org/openapitools/server/api/PetApi.scala
    path("pet" / "findByStatus") {
      get {
        parameters("status".as[String].?) { (status) =>
            petService.findPetsByStatus(status = status)
        }
> # service also become recieving optional value
> grep findPetsByStatus /var/tmp/scala-akka-http-server/src/main/scala/org/openapitools/server/api/PetApi.scala
            petService.findPetsByStatus(status = status)
  def findPetsByStatus200(responsePetarray: Seq[Pet])(implicit toEntityMarshallerPetarray: ToEntityMarshaller[Seq[Pet]]): Route =
  def findPetsByStatus400: Route =
  def findPetsByStatus(status: Option[String])

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• Run the following to build the project and update samples:

  ./mvnw clean package 
  ./bin/generate-samples.sh
  ./bin/utils/export_docs_generators.sh
  

  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
  For Windows users, please run the script in Git BASH.
• File the PR against the correct branch: master (5.3.0), 6.0.x
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.
  • @clasnake, @jimschubert, @shijinkui, @ramzimaalej, @chameleon82, @Bouillie

[krrrr38]

Except primitiveParamTypes, there is no support in akka-http-server. So removed default value too.

[wing328]

Tested this change and got

    path("pet" / "findByStatus") { 
      get { 
        parameters("status".as[String].?) { (status) => 
            petService.findPetsByStatus(status = status)
        }

and it compiles without issues so I'll go ahead to merge it into master. Thanks for the PR.