Singular modifier specified as a string causes crash

[j-f1]

Example: https://ke-complex-modifications.pqrs.org/#command_q

This modification contains this JSON:

{
  // ...
  "to": [
    {
      "key_code": "q",
      "modifiers": "left_command"
    }
  ]
  // ...
}

…and the parseKeys function in MainForm.tsx expects an array:

karabiner-complex-rules-generator/src/components/MainForm.tsx

Lines 85 to 87 in 90cbbd1

	const parseKeys = (modifiers: any[]) => {
	return modifiers.map(parseKey);
	};