cookie: set ->running in cookie_init even if data is NULL

This is a regression introduced in b1b326e (shipped in curl 8.1.0)

Test 3103 verifies.

Fixes #11875
Reported-by: wangp on github
Closes #11876

lib/cookie.c

@@ -1266,8 +1266,8 @@ struct CookieInfo *Curl_cookie_init(struct Curl_easy *data,
         fclose(handle);
     }
     data->state.cookie_engine = TRUE;
-    c->running = TRUE;          /* now, we're running */
   }
+  c->running = TRUE;          /* now, we're running */
 
   return c;