Add missing route

While there was a function and a derive, this endpoint wasn't part of
the routes. Since Bitwarden does have this endpoint ill add the route
instead of deleting it.

Fixes #4076
Fixes #4144

src/api/core/emergency_access.rs

@@ -18,6 +18,7 @@ pub fn routes() -> Vec<Route> {
         get_grantees,
         get_emergency_access,
         put_emergency_access,
+        post_emergency_access,
         delete_emergency_access,
         post_delete_emergency_access,
         send_invite,