Fix element selectors to account for extra classes

Using class= requires an exact match

ee/spec/features/projects/environments/environments_spec.rb

@@ -45,7 +45,7 @@ describe 'Environments page', :js do
 
       it 'shows an enabled play button' do
         find('.js-environment-actions-dropdown').click
-        play_button = %q{button[class="js-manual-action-link no-btn btn"]}
+        play_button = %q{button.js-manual-action-link.no-btn.btn}
 
         expect(page).to have_selector(play_button)
       end
@@ -127,7 +127,7 @@ describe 'Environments page', :js do
 
       it 'show a disabled play button' do
         find('.js-environment-actions-dropdown').click
-        disabled_play_button = %q{button[class="js-manual-action-link no-btn btn disabled"]}
+        disabled_play_button = %q{button.js-manual-action-link.no-btn.btn.disabled}
 
         expect(page).to have_selector(disabled_play_button)
       end