test_web: Improve fullscreen test case.
test_web: Improve fullscreen test case.

Improved fullscreen api tests not to show other widgets when web page requires fullscreen.

rvandegrift/elementary,tasn/elementary,tasn/elementary,FlorentRevest/Elementary,tasn/elementary,tasn/elementary,rvandegrift/elementary,FlorentRevest/Elementary,FlorentRevest/Elementary,FlorentRevest/Elementary,rvandegrift/elementary,tasn/elementary,rvandegrift/elementary