Apply (but don't add) Capybara/SpecificMatcher rule

This rule was added in rubocop-rspec 2.12.0, and we were already
following it most of the time.

However, the rule isn't working correctly in some cases, such as input
selectors, so we aren't enabling it.

spec/components/admin/poll/officers/officers_component_spec.rb

@@ -35,6 +35,6 @@ describe Admin::Poll::Officers::OfficersComponent, :admin do
   it "accepts table options" do
     render_inline Admin::Poll::Officers::OfficersComponent.new(officers, class: "my-officers-table")
 
-    expect(page).to have_css "table.my-officers-table"
+    expect(page).to have_table class: "my-officers-table"
   end
 end