Fix FTBFS on openSUSE Tumbleweed

formula.cc:294:1: error: narrowing conversion of '128' from 'int' to 'TQP_INT8' {aka 'char'} [-Wnarrowing]

Signed-off-by: François Andriot <francois.andriot@free.fr>
(cherry picked from commit 9d008f46e1)

filters/kspread/qpro/libqpro/qpro/formula.h

@@ -35,7 +35,7 @@ protected:
 
 struct QpFormulaConv
 {
-   TQP_INT8       cOperand;
+   TQP_UINT8       cOperand;
    void        (*cFunc)(QpFormula& pThis, const char* pArg);
    const char*   cArg;
 };