preparser: remove timeout from Push
On top on !6142 (merged) and !6149 (merged)
It's weird to setup 2 different timeouts. Generally, a preparser has either no timeout at all (when browsing and cancellable by the user) or the default timeout (not cancellable by the user).
vlc_preparser_SetTimeout
will be removed once !3503 is merged.
Edited by Thomas Guillem