Allez, correction de quelques bugs

From Jason Ruymen

A strongly recommened update for Left 4 Dead is now available. Please run hldsupdatetool to receive the update. The specific changes include:

- Fixed campaign image not updating correctly when creating a lobby
- Increased the reliabilty of the Steam Group server display
- Made mm_dedicated_search_maxping available to allow users to set the maximum acceptable ping for a dedicated server. The default has also been lowered 150ms, down from 300ms
- Fixed an issue where rescue closet doors could be opened in Crash Course in Versus mode

Jason