Fix being stuck in edit mode when deleting the edited status (#22126)

app/javascript/mastodon/reducers/compose.js

@@ -431,6 +431,8 @@ export default function compose(state = initialState, action) {
   case TIMELINE_DELETE:
     if (action.id === state.get('in_reply_to')) {
       return state.set('in_reply_to', null);
+    } else if (action.id === state.get('id')) {
+      return state.set('id', null);
     } else {
       return state;
     }