tinystdio: Add a fix for rounding in case of 0 decimal places for fmode #17
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before this change, in case of rouding to 0 decimal places with fmode for 0 < x < 1
some numbers get printed incorrectly such as 0,45 gets rounded to 1 instead of 0
it's because rounding happens in dtoa_ryu.c d2d function then another rounding
happens in vfprintf function itself, because that cascading rounding results in
incorrect results incase of rounding to 0 decimal places, this change prevents
the extra rounding that happens in dtoa_ryu.c and rely on vfprintf rounding for
this case.