Put feature flags empty state buttons in same row

app/views/projects/feature_flags/_empty_state.html.haml

@@ -11,8 +11,5 @@
           = s_('FeatureFlags|Feature flags allow you to configure your code into different flavors by dynamically toggling certain functionality.')
           = link_to 'More information', help_page_path("user/project/operations/feature_flags")
 
-        .text-center
-          = render 'new_feature_flag_button'
-
-        .text-center
-          = render 'configure_feature_flags_button'
+        = render 'new_feature_flag_button'
+        = render 'configure_feature_flags_button'