Fix for userId_example.html

[shikhar-dev-proj]

Type of change

• Bugfix
• Feature
• New bidder adapter
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Does this change affect user-facing APIs or examples documented on http://prebid.org?
• Other

Description of change

On running gulp serve and navigating to integrationExamples/gpt/userId_example.html?pbjs_debug=true, one can see prebid initialised but the bids are not generated.

Issue arises due to:-

1. no mediaTypes configuration in adUnit (test-div).
2. usersync instead of userSync present in setConfig method.
   Fixes of these both are available in this pr and results in correct behaviour in terms of userIds in pbjs.getUserIds() and bids in pbjs.adUnits.

Find the attached console output which shows the error

.

[shikhar-dev-proj]

Hi @jlukas79, can we merge this pr?
Please let me know if anything required at my end.

[smenzer]

LGTM

[smenzer]

this example page is now broken because it relies on tcf 1 which is no longer supported by the IAB, so the vendorlist.json is failing to load. this is a problem with the other examples, too, though, so that should be corrected separately. i'll go ahead and merge this for now.