Fix rendering artifacts in Okular with "draw border around links" turned on

Qt5 changed the default QPen to not be cosmetic, so we need to specify we want it to be cosmetic

BUGS: 375719

ui/pagepainter.cpp

@@ -836,7 +836,7 @@ void PagePainter::paintCroppedPageOnPainter( QPainter * destPainter, const Okula
             {
                 if ( limitsEnlarged.intersects( rect->boundingRect( scaledWidth, scaledHeight ).translated( -scaledCrop.topLeft() ) ) )
                 {
-                    mixedPainter->strokePath( rect->region(), QPen( normalColor ) );
+                    mixedPainter->strokePath( rect->region(), QPen( normalColor, 0 ) );
                 }
             }
         }

ui/pagepainter.h

@@ -71,8 +71,8 @@ class Q_DECL_EXPORT PagePainter
         static void drawShapeOnImage(
             QImage & image,
             const NormalizedPath & imagePoints,
-            bool closeShape = true,
-            const QPen & pen = QPen(),
+            bool closeShape,
+            const QPen & pen,
             const QBrush & brush = QBrush(),
             double penWidthMultiplier = 1.0,
             RasterOperation op = Normal