PDF: code tidies

Take by QByteArrayView instead of const QByteArray &.

This work has been kindly sponsored by the QGIS project
(https://qgis.org/).

Change-Id: I2a5b96ba81fc16487e25be3e957c50ea1b11be76
Reviewed-by: Albert Astals Cid <aacid@kde.org>
Reviewed-by: Tobias Koenig <tobias.koenig@kdab.com>

src/gui/painting/qpdf_p.h

@@ -319,7 +319,7 @@ private:
     int addXrefEntry(int object, bool printostr = true);
     void printString(QStringView string);
     void xprintf(const char* fmt, ...);
-    inline void write(const QByteArray &data) {
+    inline void write(QByteArrayView data) {
         stream->writeRawData(data.constData(), data.size());
         streampos += data.size();
     }