fix: update openApp(app) to not error when app is an array

[raymondji]

openApp(apps.chrome) is one of the examples in the documentation:

// Open an app with arguments.
await openApp(apps.chrome, {arguments: ['--incognito']});

However this fails on WSL because openApp asserts that the app arguement is a string, but apps.chrome is an array of strings.

This PR fixes the issue by allowing arrays as well in the type check.

Repro steps:

• Open WSL
• Clone this repo https://github.com/raymondji/open-openApp-repro
• Run node index.js

Expected result:

• Opens chrome

Got result:

• Error: "TypeError: Expected a name"

Testing done:

• Do the same repro steps, but run node index.js --withFix instead
• Verified this opens chrome as expected