Update index.js (#9913)

modules/prebidServerBidAdapter/index.js

@@ -260,9 +260,7 @@ function queueSync(bidderCodes, gdprConsent, uspConsent, gppConsent, s2sConfig)
   }
 
   if (gppConsent) {
-    // proposing the following formatting, can adjust if needed...
-    // update - leaving this param as an array, since it's part of a POST payload where the [] characters shouldn't matter too much
-    payload.gpp_sid = gppConsent.applicableSections
+    payload.gpp_sid = gppConsent.applicableSections.join();
     // should we add check if applicableSections was not equal to -1 (where user was out of scope)?
     //   this would be similar to what was done above for TCF
     payload.gpp = gppConsent.gppString;