[BREAKING CHANGE] Use maps for wgEnabledTranscodeSet
Changes these config settings from lists to maps, which makes it
easier to switch things specifically on or off from config.
Valid configs are now listed in the var with false even if disabled.
This is a breaking change for configurations using manual overrides,
but simplifies administration once updated.
Bug: T118080
Change-Id: Ia2c60232bd035a31046882474211874bf18b049d
(cherry picked from commit d84c53b1147aa67ba17419b1d9c5ea88a98548e7)
5 files changed