Fix inspectors element selector
Fix inspectors element selector

Summary: Element selection got broken due to change in tree output format

Reviewed By: lawrencelomax

Differential Revision: D3943574

fbshipit-source-id: e0d66048ea51f671b2e735a0135ace23e4b22aff

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