fix: unhelpful error message for invite link user creation (#4621)

* remove the hardcoded generic message instead of the actual validation error

* lint

---------

Co-authored-by: shatfield4 <seanhatfield5@gmail.com>
Co-authored-by: Timothy Carambat <rambat1010@gmail.com>

server/endpoints/invite.js

@@ -56,9 +56,7 @@ function inviteEndpoints(app) {
         });
         if (!user) {
           console.error("Accepting invite:", error);
-          response
-            .status(200)
-            .json({ success: false, error: "Could not create user." });
+          response.status(200).json({ success: false, error });
           return;
         }