[Glitch] Fix “mark as sensitive” not being used in delete & redraft

Port 024ec0759c to glitch-soc

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

@@ -442,6 +442,7 @@ export default function compose(state = initialState, action) {
       map.set('focusDate', new Date());
       map.set('caretPosition', null);
       map.set('idempotencyKey', uuid());
+      map.set('sensitive', action.status.get('sensitive'));
 
       if (action.status.get('spoiler_text').length > 0) {
         map.set('spoiler', true);