Fix multiple bugs in notification requests and notification policies (#32062)

app/javascript/mastodon/api/notifications.ts

@@ -91,5 +91,5 @@ export const apiAcceptNotificationRequests = async (id: string[]) => {
 };
 
 export const apiDismissNotificationRequests = async (id: string[]) => {
-  return apiRequestPost('v1/notifications/dismiss/dismiss', { id });
+  return apiRequestPost('v1/notifications/requests/dismiss', { id });
 };