Update Minimal Rundown Default Keyword

[brianrob]

The minimal rundown keyword should be ForceEndRundown instead of a non-existent keyword. This is required in order to support gathering the runtime version events from .NET Core. .NET Core no longer unconditionally emits the runtime version event without actually asking for rundown, however, if we only specify ForceEndRundown, the runtime will skip the expensive parts of rundown and just emit the runtime version event.