[issue39434] Remove unnecessary logic of float __floordiv__

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

Small style question: using 5 spaces in https://github.com/python/cpython/blob/master/Objects/floatobject.c#L655-L664 after PR 18147 merged.
Due to bpo don't receive style quesiton, I commented here.

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nosy: +shihai1991

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