fix(browserstack): issue with vendor prefix

[kobenguyent]

Motivation/Description of the PR

• Resolves Issue with appiumV2 Flag and BrowserStack Integration #3844

Tested config:

export const caps = {
    androidCaps: {
        appiumV2: true,
        host: "hub-cloud.browserstack.com",
        port: 4444,
        user: process.env.BROWSERSTACK_USER,
        key: process.env.BROWSERSTACK_KEY,
        'app': `bs://c700ce60cf13ae8ed97705a55b8e022f1hjhkjh3c5827c`,
        browser: '',
        desiredCapabilities: {
            'appPackage': data.packageName,
            'deviceName': process.env.DEVICE || 'Google Pixel 3',
            'platformName': process.env.PLATFORM || 'android',
            'platformVersion': process.env.OS_VERSION || '10.0',
            'automationName': process.env.ENGINE || 'UIAutomator2',
            'newCommandTimeout': 300000,
            'androidDeviceReadyTimeout': 300000,
            'androidInstallTimeout': 90000,
            'appWaitDuration': 300000,
            'autoGrantPermissions': true,
            'gpsEnabled': true,
            'isHeadless': false,
            'noReset': false,
            'noSign': true,
            'bstack:options' : {
                "appiumVersion" : "2.0.1",
            },
        }
    },
}

Helpers: Appium
Plugins: screenshotOnFail

App Installation @android --
    [1]  Starting recording promises
    Timeouts: 
  App is installed successfully
    I see app is installed "org.wikipedia.alpha"
  ✔ OK in 339ms


  OK  | 1 passed   // 2m

Applicable helpers:

• Appium

Type of change

• 🐛 Bug fix

Checklist:

• Tests have been added
• Documentation has been added (Run npm run docs)
• Lint checking (Run npm run lint)
• Local tests are passed (Run npm test)