Drop "%O" in access logger

[fafhrd91]

implementation for "%O" is wrong. output_size was never designed to use as response size.

@asvetlov @kxepal

[fafhrd91]

I will change "%O" to use same value as "%b", but we need to decide what to do with it in general

[kxepal]

I'm fine with either decision here since I didn't get the idea of these magic tokens at all (:

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