Adding of index on array elements is unnecessary

[Mazgis47]

Currently, the index of each array item is appended in a form of [x] e.g. [0]. However swagger does not append that and I believe such indexes should not be added by oapi-codegen too.

Example:

openapi: 3.0.3
info:
  version: 0.0.1
  title: Test array
  description: Test Array
servers:
  - url: http://localhost:8081
    description: local
tags:
  - name: test
paths:
  /v1/asns:
    get:
      summary: Search Asn
      operationId: searchAsn
      tags:
        - asn
      parameters:
        - $ref: "#/components/parameters/QueryTenantUUID"
      responses:
        "200":
          description: Success
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/AsnsResponse"
components:
  parameters:
    QueryTenantUUID:
      name: tenant_uuid
      in: query
      style: deepObject
      schema:
        $ref: "#/components/schemas/Filter"
      examples:
        advanced:
          value:
            op: eq
            vals:
              - aaaaaa
              - bbbbbb
  schemas:
    Filter:
      type: object
      required:
        - op
        - vals
      properties:
        op:
          description: Filter operation like equals, greater than, not equals, less than ...
          type: string
          enum:
            - eq
            - ne
            - lt
            - lte
            - gt
            - gte
            - like
        vals:
          type: array
          items: {}
          description: Values can be any type for filtering
    AsnsResponse:
      type: object
      properties:
        data:
          type: array
          items:
            $ref: "#/components/schemas/Asn"
    Asn:
      type: object
      properties:
        tenant_uuid:
          type: string
          format: uuid
          example: "aaaaaa"

https://editor.swagger.io/ generates the request without indexes, and this difference causes problems to parse the parameters correctly.

http://localhost/v1/asns?tenant_uuid%5Bop%5D=eq&tenant_uuid%5Bvals%5D=aaaaaa&tenant_uuid%5Bvals%5D=bbbbbb
without encoding:
http://localhost/v1/asns?tenant_uuid[op]=eq&tenant_uuid[vals]=aaaaaa&tenant_uuid[vals]=bbbbbb

codegen generates with the indexes as:
http://localhost/v1/asns?tenant_uuid[op]=eq&tenant_uuid[vals][0]=aaaaaa&tenant_uuid[vals][1]=bbbbbb