[Glitch] Fix being stuck in edit mode when deleting the edited status

Port ebf1d74e40 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/reducers/compose.js

@@ -538,6 +538,8 @@ 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;
     }