fix(services/auth): fix ERR_HTTP_HEADERS_SENT errors on new unitialized Setups

was previously showing two errors:
Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client

Author: pano9000

src/services/auth.ts

@@ -15,7 +15,7 @@ const noAuthentication = config.General && config.General.noAuthentication === t
 
 function checkAuth(req: Request, res: Response, next: NextFunction) {
     if (!sqlInit.isDbInitialized()) {
-        res.redirect('setup');
+        return res.redirect('setup');
     }
 
     const currentTotpStatus = totp.isTotpEnabled();