Fix 1e5, 1e-5 evaluated as Infinity

[yuxiaomao]

Previously 1e5, 1e-5 are evaluated as EConst(CFloat(Infinity)), caused by division by exp (which is 0).

hscript/hscript/Parser.hx

Line 1396 in df4d43a

return TConst(CFloat((Math.pow(10, pow) / exp) * n * 10));