add error log when 2FA can't be enabled

src/xrpc/com_atproto_server.rs

···
                         .bind(&did_row.0)
                         .execute(&state.pds_gatekeeper_pool)
                         .await
-                        .map_err(|_| StatusCode::BAD_REQUEST)?;
+                        .map_err(|err| {
+                           log::error!("Error enabling 2FA: {err}");
+                           StatusCode::BAD_REQUEST
+                         })?;
 
                     Ok(StatusCode::OK.into_response())
                 }