vnc: tight: tweak adaptive tight settings

The force_jpeg threshold was too low.
Signed-off-by: NCorentin Chary <corentincj@iksaif.net>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

ui/vnc-enc-tight.c

@@ -79,16 +79,16 @@ static const struct {
     int jpeg_idx;               /* Allow indexed JPEG */
     int jpeg_full;              /* Allow full color JPEG */
 } tight_jpeg_conf[] = {
-    { 0,   4,  1, 1 },
-    { 0,   4,  1, 1 },
-    { 0,   4,  1, 1 },
-    { 0,   4,  1, 1 },
-    { 0,   4,  0, 1 },
-    { 0.1, 4,  0, 1 },
-    { 0.2, 4,  0, 1 },
-    { 0.3, 6,  0, 0 },
-    { 0.4, 8,  0, 0 },
-    { 0.5, 10, 0, 0 },
+    { 0,   8,  1, 1 },
+    { 0,   8,  1, 1 },
+    { 0,   8,  1, 1 },
+    { 0,   8,  1, 1 },
+    { 0,   10, 1, 1 },
+    { 0.1, 10, 1, 1 },
+    { 0.2, 10, 1, 1 },
+    { 0.3, 12, 0, 0 },
+    { 0.4, 14, 0, 0 },
+    { 0.5, 16, 0, 0 },
 };
 #endif