[BUG] allOf generates false import with typescript-angular format

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?
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Description

False import. When using allOf with 2 objects of different type.

openapi-generator version

6.4.0

OpenAPI declaration file content or url

{
  "openapi": "3.0.0",
  "info": {
    "title": "allOf bug example",
    "version": "1"
  },
  "paths": {
    "/foo": {
      "get": {
        "tags": [
          "entry"
        ],
        "responses": {
          "200": {
            "description": "200 Response"
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "ConvertableFileSchema": {
        "type": "object",
        "properties": {
          "inputFormat": {
            "allOf": [
              {
                "$ref": "#/components/schemas/InputFormatEnum"
              },
              {
                "type": "object"
              }
            ]
          }
        }
      },
      "InputFormatEnum": {
        "type": "string"
      }
    }
  }
}

Steps to reproduce

Run openapi-generator-cli generate -i [PATH_TO_JSON] -g typescript-angular -o [OUTPUT_PATH]