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Fix gamma ramp prediction

Jonas Ådahl requested to merge jadahl/mutter:wip/fix-gamma-ramp-prediction into master

Quoting the last commit

    If we did a mode set, the gamma may have been changed by the kernel, and
    if we didn't also update the gamma in the same transaction, we have no
    way to predict the current gamma ramp state. In this case, read the
    gamma state directly from KMS.
    
    This should be relatively harmless regarding the race conditions the
    state prediction was meant to solve, as the worst case is we get none or
    out of date gamma ramps; and since this is for when gamma ramps are not
    updated at mode setting time, we'd get intermediate gamma state to begin
    with, so it's not worse than what we currently do anyway.

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