Fix build with poppler-26.02.0.

Index: filters/karbon/pdf/SvgOutputDev.h
--- filters/karbon/pdf/SvgOutputDev.h.orig
+++ filters/karbon/pdf/SvgOutputDev.h
@@ -69,7 +69,7 @@ class SvgOutputDev : public OutputDev (public)
 private:
     QString convertPath(const GfxPath *path);
     QString convertMatrix(const QTransform &matrix);
-    QString convertMatrix(const double *matrix);
+    QString convertMatrix(const std::array<double, 6> &matrix);
     QString printFill();
     QString printStroke();
 
