[BUG][scala-akka-http-server]When there are several header parameters, curly brackets are wrongly closed

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

When a method contains several header parameters, some closing curly brackets are missing and the file is thus badly formatted.

openapi-generator version

7.3.0

OpenAPI declaration file content or url

openapi: 3.0.2
info:
  version: 1.0.17
  title: Swagger Petstore - OpenAPI 3.0
paths:
  '/pet/{petId}':
    delete:
      summary: Deletes a pet
      description: ''
      operationId: deletePet
      parameters:
        - name: api_key
          in: header
          description: ''
          required: false
          schema:
            type: string
        - name: requestId
          in: header
          description: ''
          required: false
          schema:
            type: string
        - name: petId
          in: path
          description: Pet id to delete
          required: true
          schema:
            type: integer
            format: int64
      responses:
        '400':
          description: Invalid pet value

Command line used for generation

java -jar openapi-generator-cli-7.3.0.jar generate -g scala-akka-http-server -i petstore.yml

Steps to reproduce

The DefaultApi.scala generated with previous command on example above is the following:

package org.openapitools.server.api

import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.server.Route
import akka.http.scaladsl.model.StatusCodes
import org.openapitools.server.AkkaHttpHelper._


class DefaultApi(
    defaultService: DefaultApiService
) {

  
  
  lazy val route: Route =
    path("pet" / LongNumber) { (petId) => 
      delete {  
          optionalHeaderValueByName("api_key") { apiKey => optionalHeaderValueByName("requestId") { requestId => 
            defaultService.deletePet(petId = petId, apiKey = apiKey, requestId = requestId)
          }
      }
    }
}


trait DefaultApiService {

  def deletePet400: Route =
    complete((400, "Invalid pet value"))
  /**
   * Code: 400, Message: Invalid pet value
   */
  def deletePet(petId: Long, apiKey: Option[String], requestId: Option[String]): Route

}

Related issues/PRs

None

Suggest a fix/enhancement

Start by running the provided generator command with the example OpenAPI declaration and inspect the generated DefaultApi.scala route for the header parameters. Compare the braces around apiKey and requestId, then verify that generated Scala output is correctly balanced and formatted when several headers are present.