fix: set preview user directly

Signed-off-by: Pranav C <pranavxc@gmail.com>

packages/nocodb-nest/src/guards/global/global.guard.ts

@@ -2,8 +2,8 @@ import { Injectable } from '@nestjs/common';
 import { AuthGuard } from '@nestjs/passport';
 import { lastValueFrom, Observable } from 'rxjs';
 import { JwtStrategy } from '../../strategies/jwt.strategy';
+import extractRolesObj from '../../utils/extractRolesObj';
 import type { ExecutionContext } from '@nestjs/common';
-import extractRolesObj from '../../utils/extractRolesObj'
 
 @Injectable()
 export class GlobalGuard extends AuthGuard(['jwt']) {
@@ -27,7 +27,7 @@ export class GlobalGuard extends AuthGuard(['jwt']) {
         req.header('xc-preview') &&
         ['owner', 'creator'].some((role) => req.user.roles?.[role])
       ) {
-        return this.authenticate(req,{
+        return (req.user = {
           ...req.user,
           isAuthorized: true,
           roles: extractRolesObj(req.header('xc-preview')),