fix: show siblings schema with oneOf

[AlexVarchuk]

What/Why/How?

fix a bug when oneOf has siblings and it doesn't render correct
fixes #641
fixes #743

   Main:
      title: Sale
      description: A request to authorize and capture funds.
      allOf:
        - $ref: '#/components/schemas/Anything1'
        - type: object
          properties:
            d:
              type: number
          oneOf:
            - $ref: '#/components/schemas/Anything2'
            - $ref: '#/components/schemas/Anything3'
    Anything1:
      type: object
      properties:
        a:
          type: string

    Anything2:
      type: object
      properties:
        b:
          type: string

    Anything3:
      type: object
      properties:
        c:
          type: string

   foo:
      type: object
      properties:
        property1:
          type: string
        property2:
          type: string
        property3:
          type: string
        property4:
          type: string
        property5:
          type: string
        property6:
          type: string
      oneOf:
        - required:
          - property1
          - property2
          - property6
        - required:
          - property1
          - property5

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