Fix showbox + add support for new simple-proxy version

src/fetchers/simpleProxy.ts

@@ -7,6 +7,7 @@ const headerMap: Record<string, string> = {
   cookie: 'X-Cookie',
   referer: 'X-Referer',
   origin: 'X-Origin',
+  'user-agent': 'X-User-Agent',
 };
 
 const responseHeaderMap: Record<string, string> = {

src/providers/sources/showbox/sendRequest.ts

@@ -49,9 +49,9 @@ export const sendRequest = async (ctx: ScrapeContext, data: object, altApi = fal
     headers: {
       Platform: 'android',
       'Content-Type': 'application/x-www-form-urlencoded',
+      'User-Agent': 'okhttp/3.2.0',
     },
     body: formatted,
   });
-
   return JSON.parse(response);
 };