Change element_with_pattern cop to not use quotes

Using quotes within string validations can be messy. Let's
use  a typical CSS selector for an unquoted attribute

Update the cop spec to validate appropriate new message

rubocop/cop/qa/element_with_pattern.rb

@@ -30,7 +30,7 @@ module RuboCop
           return if args.first.nil?
 
           args.first.each_node(:str) do |arg|
-            add_offense(arg, message: MESSAGE % "data-qa-selector=\"#{element_name.value}\"")
+            add_offense(arg, message: MESSAGE % "data-qa-selector=#{element_name.value}")
           end
         end
 

spec/rubocop/cop/qa/element_with_pattern_spec.rb

@@ -23,9 +23,9 @@ describe RuboCop::Cop::QA::ElementWithPattern do
       expect_offense(<<-RUBY)
       view 'app/views/shared/groups/_search_form.html.haml' do
         element :groups_filter, 'search_field_tag :filter'
-                                ^^^^^^^^^^^^^^^^^^^^^^^^^^ Don't use a pattern for element, create a corresponding `qa-groups-filter` instead.
+                                ^^^^^^^^^^^^^^^^^^^^^^^^^^ Don't use a pattern for element, create a corresponding `data-qa-selector=groups_filter` instead.
         element :groups_filter_placeholder, /Search by name/
-                                             ^^^^^^^^^^^^^^ Don't use a pattern for element, create a corresponding `qa-groups-filter-placeholder` instead.
+                                             ^^^^^^^^^^^^^^ Don't use a pattern for element, create a corresponding `data-qa-selector=groups_filter_placeholder` instead.
       end
       RUBY
     end