Bug: enum with 1 value is not an enum in the JSON schema (evaluates as constant)

Description

When you export an enum with one value it maps to a constant in the schema, but I expect it to map to an enum with one element.

Reproduction

see the reproduction in the following codesandbox: https://codesandbox.io/p/sandbox/lucid-kirch-r3rxlg

in short, the input typescript file is

export enum Test {
  apple = "apple",
}

export enum Test2 {
  apple = "apple",
  orange = "orange",
}

And the command to compile into json schema is

npx typescript-json-schema index.ts '*' -o out/generated.json --required --aliasRefs --refs --titles --propOrder --noExtraProps

Expected Results

I expect the results to be an enum with one element

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "definitions": {
        "Test": {
            "enum": [
                "apple"
            ],
            "type": "string"
        },
        "Test2": {
            "enum": [
                "apple",
                "orange"
            ],
            "type": "string"
        }
    }
}

Actual Results

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "definitions": {
        "Test": {
            "const": "apple",
            "type": "string"
        },
        "Test2": {
            "enum": [
                "apple",
                "orange"
            ],
            "type": "string"
        }
    }
}

Start with the TypeScript example in index.ts and run the npx typescript-json-schema command from the issue, or open the linked CodeSandbox. Compare the generated definitions for Test and Test2 with the expected JSON: the single-value Test should use an enum containing "apple" rather than a const.