webdriver: WebKitWebDriver: browsername should be an empty string to …

…avoid `Failed to match capabilities`

fixes tauri-apps/tauri#8828

docs/guides/testing/webdriver/example/selenium.md

@@ -165,7 +165,7 @@ before(async function () {
 
   const capabilities = new Capabilities()
   capabilities.set('tauri:options', { application })
-  capabilities.setBrowserName('wry')
+  capabilities.setBrowserName('')
 
   // start the webdriver client
   driver = await new Builder()