Add a “Block & Report” button to the block confirmation dialog (#10360)

app/javascript/styles/mastodon/components.scss

@@ -4128,6 +4128,7 @@ a.status-card.compact:hover {
 
 .confirmation-modal__action-bar,
 .mute-modal__action-bar {
+  .confirmation-modal__secondary-button,
   .confirmation-modal__cancel-button,
   .mute-modal__cancel-button {
     background-color: transparent;