PBS Bid Adapter: Stop overriding s2sconfig.enabled from vendor defaul…

…ts (#6622)

* Update eids.js

* Update eids_spec.js

* Update eids.js

* Update pubmaticBidAdapter_spec.js

* Update eids.js

* Update eids_spec.js

* Update conversantBidAdapter_spec.js

* Update rubiconBidAdapter_spec.js

* Update conversantBidAdapter_spec.js

* Delete test/spec/adapters directory

* Update userId_spec.js

* Delete iasBidAdapter.js

* Add files via upload

* Update index.js

modules/prebidServerBidAdapter/index.js

@@ -89,7 +89,7 @@ config.setDefaults({
  * @return {boolean}
  */
 function updateConfigDefaultVendor(option) {
-  if (option.defaultVendor) {
+  if (option.defaultVendor && option.enabled !== false) {
     let vendor = option.defaultVendor;
     let optionKeys = Object.keys(option);
     if (S2S_VENDORS[vendor]) {