Rename class name to be consistent with the name of tested functions

Rename class name to be consistent with the name of tested functions

ewk_back_forward_list_item_at_index_get
ewk_back_forward_list_n_back_items_copy
ewk_back_forward_list_n_forward_items_copy
ewk_certificate_policy_decision_certificate_pem_get
ewk_certificate_policy_decision_url_get
ewk_context_cache_disabled_set
ewk_settings_loads_images_automatically_set
ewk_user_media_permission_request_suspend
ewk_view_notification_closed

Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=9483
Reviewed by: Antonio Gomes, Piotr Tworek, SeungSeop Park

Change-Id: Iebb2ad9a40d332d5b81f49601f23262278662c86
Signed-off-by: Piotr Sieduszewski <p.sieduszews@samsung.com>