[EFL] ewk_context_menu_item_select test have been failed

[EFL] ewk_context_menu_item_select test have been failed
https://bugs.webkit.org/show_bug.cgi?id=162143

Reviewed by Gyuyoung Kim.

ewk_context_menu_item_select has been waited until test page loading is finished, but it is
unnecessary to wait the loading is finished. It would be good to pass if *testFinished*
flag is true.

* UIProcess/API/efl/tests/test_ewk2_context_menu.cpp:
(EWK2ContextMenuTest::checkBasicContextMenuItem):
(EWK2ContextMenuTest::testContextMenu):
(TEST_F):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@206194 268f45cc-cd09-0410-ab3c-d52691b4dbfc