[BUG] Oauth flows are not generated when there is more than 1

Created by: bilak

Description

When working with multiple oauth flows in definition and then using some kind of templates to use those flows, only first flow that is found is used. Problem is in DefaultCodegen where it's not iterated through all flows, but just first flow is taken.

openapi-generator version

4.2.3

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: test api
  version: 0.0.1
paths:
  /imports:
    post:
      summary: Creates import
      operationId: createImport
      responses:
        201:
          description: created
      security:
        - oauth_auth:
            - import:create
  /imports/{importId}/state:
    put:
      summary: Changes import state
      operationId: changeImportState
      parameters:
        - name: importId
          in: path
          required: true
          schema:
            type: string
      responses:
        200:
          description: State changed
      security:
        - oauht_auth:
            - import:process
components:
  securitySchemes:
    oauth_auth:
      type: oauth2
      flows:
        password:
          tokenUrl: "../auth/realms/master/protocol/openid-connect/token"
          scopes:
            import:create: create import
        clientCredentials:
          tokenUrl: "../auth/realms/master/protocol/openid-connect/token"
          scopes:
            import:create: create import
            import:process: process import

Suggest a fix

Loop inside method DefaultCodegen#fromSecurity also through all flows and then they should be generated.