Send string to picker when setting value
Send string to picker when setting value

Summary:
I'm not at all certain that this is the correct way to do this, but it fixes the problem.

When sending text to a PickerWheel, in order to set it, the array value is not found in the possible values and it is rejected. So concatenate the array into a string.

See https://github.com/appium/appium/issues/6873
Closes https://github.com/facebook/WebDriverAgent/pull/295

Differential Revision: D3907080

Pulled By: marekcirkos

fbshipit-source-id: 11bb2201e3672b8ad5c3eb826fcb6a573aa2ef6a

riccoyu/WebDriverAgent,Gogle/WebDriverAgent,PiranhaTeam/WebDriverAgent,riccoyu/WebDriverAgent,qa-dev/WebDriverAgent,b1ueshad0w/WebDriverAgent,qa-dev/WebDriverAgent,PiranhaTeam/WebDriverAgent,drptbl/WebDriverAgent,zenzhu/WebDriverAgent,zenzhu/WebDriverAgent,b1ueshad0w/WebDriverAgent,b1ueshad0w/WebDriverAgent,calabash/WebDriverAgent,ymin/WebDriverAgent,ymin/WebDriverAgent,ymin/WebDriverAgent,PiranhaTeam/WebDriverAgent,riccoyu/WebDriverAgent,ymin/WebDriverAgent,qa-dev/WebDriverAgent,drptbl/WebDriverAgent,calabash/WebDriverAgent,PiranhaTeam/WebDriverAgent,zenzhu/WebDriverAgent,drptbl/WebDriverAgent,PiranhaTeam/WebDriverAgent,Gogle/WebDriverAgent,b1ueshad0w/WebDriverAgent,qa-dev/WebDriverAgent,riccoyu/WebDriverAgent,Gogle/WebDriverAgent,calabash/WebDriverAgent,Gogle/WebDriverAgent