fix for broken tpu scan

ChangeLog

@@ -1,3 +1,6 @@
+2013-01-08 Rolf Bensch <rolf at bensch hyphen online dot de>
+	* backend/pixma_mp810.c: fix for broken tpu scan.
+
 2013-01-03 Paul Newall <quandry@ntlworld.com>
 	* backend/kodakaio.c kodakaio.h:
 	Detecting end of paper when using adf is now an option.

backend/pixma_mp810.c

@@ -803,6 +803,7 @@ send_scan_param (pixma_t * s)
         {
           data[0x00] = 0x04;
           data[0x01] = 0x02;
+          data[0x1e] = 0x02;  /* NB: CanoScan 8800F: 0x02->negatives, 0x01->positives, paper->0x00 */
         }
       data[0x02] = 0x01;
       if (is_scanning_from_adfdup (s))