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pdf: take device resolution into account when scaling PDF images

Reported and tested by Dirk-Wilhelm Peters <peters@schwertfisch.de>.

--- a/pdf.c

+++ b/pdf.c

@@ -660,9 +660,9 @@

 		bbox = pdf_dval_val(pdf, len, pages, "/MediaBox");

 	if (bbox >= 0 && !pdfbbox(pdf, len, bbox, dim)) {

 		if (hwid > 0)

-			hzoom = hwid / (dim[2] - dim[0]);

+			hzoom = hwid / (dim[2] - dim[0]) * 7200 / dev_res;

 		if (vwid > 0)

-			vzoom = vwid / (dim[3] - dim[1]);

+			vzoom = vwid / (dim[3] - dim[1]) * 7200 / dev_res;

 		if (vwid <= 0)

 			vzoom = hzoom;

 		if (hwid <= 0)