Update specs to be valid only for tagged runner

spec/features/runners_spec.rb

@@ -126,6 +126,9 @@ describe "Runners" do
       expect(page).to have_content 'Can run untagged jobs Yes'
     end
 
+    context 'when runner has tags' do
+      before { runner.update_attribute(:tag_list, ['tag']) }
+
       scenario 'user want to prevent runner from running untagged job' do
         visit runners_path(project)
         page.within('.activated-specific-runners') do
@@ -139,4 +142,5 @@ describe "Runners" do
         expect(runner.reload.run_untagged?).to eq false
       end
     end
+  end
 end