Duplicate level collections not being respected by UGameEngine::NetworkRemapPath

When NetworkRemapPath was refactored in 4.26 to support replay connections via the rep graph, the check for duplicate level id on the driver was lost in the new code path. This causes the demo driver to spawn actors into the wrong level collection when using it for "instant replay" playback.

• Record an in memory replay stream.
• Play it back on the active world, where dynamic levels have been duplicated with the experimental engine feature that adds an additional level collection.
• The demo driver will need a level prefix override set (via url options most likely).
• Dynamic replay actors should be spawned into the duplicate level collection, not the source levels.