restore original comment

Thanks to Sven Wehner for pointing this out.
diff --git a/sc/source/core/tool/interpr3.cxx b/sc/source/core/tool/interpr3.cxx
index 946fb7b..eb5d076 100644
--- a/sc/source/core/tool/interpr3.cxx
+++ b/sc/source/core/tool/interpr3.cxx
@@ -905,7 +905,8 @@ double ScInterpreter::GetBetaDistPDF(double fX, double fA, double fB)

/*
                x^a * (1-x)^b
    Ix(a,b)    * result of ContFrac                a * Beta(a,b)
    I_x(a,b) = ----------------  * result of ContFrac
                a * Beta(a,b)
*/
static double lcl_GetBetaHelperContFrac(double fX, double fA, double fB)
{   // like old version