Fix hairline bugs in table borders. (#34)

We need to get the full interior Area, otherwise we will have some
super small hairline gaps in the PDF. They are always small but also
always visible in the PDF indepdent of the zoom level.

openhtmltopdf-core/src/main/java/com/openhtmltopdf/render/AbstractOutputDevice.java

@@ -231,7 +231,7 @@ private void paintBackground0(
             return;
         }
 
-        Area borderBounds = new Area(BorderPainter.generateBorderBounds(backgroundBounds, border, false));
+        Area borderBounds = new Area(BorderPainter.generateBorderBounds(backgroundBounds, border, true));
 
         Shape oldclip = getClip();
         if(oldclip != null) {