Remove method that is no longer needed

I added this method recently, but it is no longer needed.

Change-Id: I0baa67ce1eb41cddde52a61bca65feede65c3994

sc/inc/cell.hxx

@@ -448,7 +448,6 @@ public:
     sal_uInt16      GetErrCode();   // interpret first if necessary
     sal_uInt16      GetRawError();  // don't interpret, just return code or result error
     short           GetFormatType() const                   { return nFormatType; }
-    void            SetFormatType( short nFType )           { nFormatType = nFType; }
     sal_uLong       GetFormatIndex() const                  { return nFormatIndex; }
     void            GetFormatInfo( short& nType, sal_uLong& nIndex ) const
                         { nType = nFormatType; nIndex = nFormatIndex; }