fix: adjust BDXL_QL_SIZE and rollback BD_SL_SIZE to upstream version

BD_SL_SIZE was mistakenly modified in 0.79.6-pl1, we restore the
previous upstream version to avoid having several dvdisaster versions
in the field with different values set for it.

If you created an RS03 augmented image with 0.79.6-pl1, you'll still
be able to conduct a repair of the image, should it be damaged,
by using any 0.79.6 version (with or without patchlevel), using
the following additional command-line parameters:
dvdisaster -f --debug -n 12219392

BDXL_QL_SIZE (introduced in pl1) was also adjusted in this version,
To repair a damaged BD-R quadruple layer image created by pl1:
dvdisaster -f --debug -n 62500864

The values that were present in pl1 were corresponding to a BD-R
burnt without formatting it for defect management first, which enabled
more space for parity data. You can still do it if you want (read
the comment in the code introduced by this commit), but to follow
upstream design, the default number of sectors for all BD-R implies
that defect management is enabled.

dvdisaster.h

@@ -105,15 +105,29 @@
  * scan and verify such images correctly as long as they 
  * are not damaged. But recovery WILL BREAK when 
  * processing a damaged image. YOU HAVE BEEN WARNED. 
+ *
+ * NOTE: If you compile a custom version with modified values,
+ * you may then use `-n X --debug' (also works on an unmodified
+ * version) to ensure a proper recovery. 'X' being the number
+ * of sectors considered when augmenting the image, which is
+ * the immediately higher #define close to the unaugmented image size.
+ * HOWEVER you MUST to remember this 'X'! It's probably a good idea
+ * to write it down directly on the media you're protecting.
+ * This way you'll have it at hand when attempting repair.
+ * You might be tempted to do it for BD-Rs, using more space
+ * for parity data by disabling defect management.
+ * Do it at your own risk.
+ *
+ * WARNING! (read above)
  */
 
 #define CDR_SIZE         (351*1024)
 #define DVD_SL_SIZE      2295104  /* DVD+R/RW size used as least common denominator */
 #define DVD_DL_SIZE 	 4171712  /* also seen: 4148992 4173824  */
-#define BD_SL_SIZE      12219392
-#define BD_DL_SIZE	23652352
-#define BDXL_TL_SIZE    47305728
-#define BDXL_QL_SIZE    (128001769472/2048)
+#define BD_SL_SIZE      11826176  /* w/o defect mgmt: 12219392 */
+#define BD_DL_SIZE      23652352  /* w/o defect mgmt: 24438784 */
+#define BDXL_TL_SIZE    47305728  /* w/o defect mgmt: 48878592 */
+#define BDXL_QL_SIZE    60403712  /* w/o defect mgmt: 62500864 */
 
 /* Maximum accepted media sizes (in 2K sectors) */