[r3159以降] SEP_THOUSAND_EXPONENTが動作しない

[z9999+]

utils/simstring.cc:55

   thousand_sep_exponent = new_thousand_sep_exponent>0 ? thousand_sep_exponent : 3;

↓

   thousand_sep_exponent = new_thousand_sep_exponent>0 ? new_thousand_sep_exponent : 3;