Remove typehint string in `frameToBeAvailableAndSwitchToIt`
Remove typehint string in `frameToBeAvailableAndSwitchToIt`

Type hints can not be used with scalar types such as int or string.

[See PHP documentation](http://www.php.net/manual/en/language.oop5.typehinting.php)
passbolt/passbolt_selenium,OndraM/php-webdriver,cedricalfonsi/php-webdriver,OndraM/php-webdriver,cedricalfonsi/php-webdriver,OndraM/php-webdriver,passbolt/passbolt_selenium,OndraM/php-webdriver