fix: displaying nested items with type string

[AlexVarchuk]

What/Why/How?

fix displaying nested items with type string.

Reference

fixes: #2516
fixes: #2544
#2358

Tests

EndpointIn:
      type: object
      properties:
        uid:
          description: Optional unique identifier for the endpoint
          type: string
          maxLength: 256
          minLength: 1
          pattern: ^[a-zA-Z0-9\-_.]+$
          example: unique-ep-identifier
          nullable: true
        plain_property:
          type: string
          pattern: '^[A-Z]+$'
          minLength: 1
          maxLength: 10
        array_items:
          type: array
          items:
            type: string
            pattern: '^[A-Z]+$'
            minLength: 1
            maxLength: 10
        macList:
          type: array
          description: MAC address list
          items:
            type: string
            pattern: ^([0-9a-f]{2}:){5}[0-9a-f]{2}$
        macList1:
          type: array
          description: MAC address list
          items:
            type: string
            pattern: ^([0-9a-f]{2}:){5}[0-9a-f]{2}$
            minLength: 17
            maxLength: 17
        channels:
          description: List of message channels this endpoint listens to (omit for all)
          type: array
          items:
            type: string
            maxLength: 128
            pattern: ^[a-zA-Z0-9\-_.]+$
            example: project_1337
          maxItems: 10
          minItems: 1
          uniqueItems: true
          nullable: true
          example:
            - project_123
            - group_2
        channels1:
          description: List of message channels this endpoint listens to (omit for all)
          type: array
          items:
            - type: string
              maxLength: 128
              pattern: ^[a-zA-Z0-9\-_.]+$
              example: project_1337
            - type: string
              maxLength: 128
              pattern: ^[a-zA-Z0-9\-_.]+$
              example: project_1337
          maxItems: 10
          minItems: 1
          uniqueItems: true
          nullable: true
          example:
            - project_123
            - group_2

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[tasn]

Thanks!