Fix for Failure to Retry request after 403

While loop condition was not being satisfied due to result being set to a value (the OpenAI response), thus the (!result) condition was False.

src/chatgpt-api-browser.ts

@@ -551,6 +551,7 @@ export class ChatGPTAPIBrowser extends AChatGPTAPI {
         } else {
           await this.refreshSession()
           await delay(1000)
+          result = null
           continue
         }
       } else {