Treat element#selector_css string appropriately

Proper escaping should be used for page/base.rb#scroll_to
as it is a single quoted JS string

qa/qa/page/element.rb

@@ -28,7 +28,7 @@ module QA
       end
 
       def selector_css
-        "[data-qa-selector='#{@name}'],.#{selector}"
+        %Q([data-qa-selector="#{@name}"],.#{selector})
       end
 
       def expression

qa/spec/page/element_spec.rb

@@ -114,7 +114,7 @@ describe QA::Page::Element do
   describe 'data-qa selectors' do
     subject { described_class.new(:my_element) }
     it 'properly translates to a data-qa-selector' do
-      expect(subject.selector_css).to include("[data-qa-selector='my_element']")
+      expect(subject.selector_css).to include(%q([data-qa-selector="my_element"]))
     end
   end
 end