Refactor another live preview scenario

But left it disabled because of bug 57967

Bug: 57967
Change-Id: I7b1543f526eac93c9a0200731a722332a7410b06

tests/browser/features/step_definitions/panel_steps.rb

@@ -68,8 +68,8 @@ Then(/^the panel is in English/) do
 	on(PanelPage).panel_language_element.text.should == "Language"
 end
 
-When(/^I switch to "Input" panel of language settings/) do
-	on(PanelPage).panel_input_element.when_visible.click
+When(/^I switch to Input panel of language settings/) do
+	on(PanelPage).panel_side_input_element.click
 end
 
 Then(/^the language list of ULS should use Autonym font$/) do