Modify backward rate 0.01 ----> 0.04  and forward rate 0.08 ----> 0.04

Signed-off-by: Leo Lu <leo.lu@starfivetech.com>

--- a/tools/gst-play.c	2023-07-03 16:13:50.119468111 +0800
+++ b/tools/gst-play.c	2023-07-03 16:12:19.939018720 +0800
@@ -519,10 +519,10 @@ play_bus_msg (GstBus * bus, GstMessage *
                       NULL, NULL)) {
                 if (button == 4) {
                   /* wheel up */
-                  relative_seek (play, +0.08);
+                  relative_seek (play, +0.04);
                 } else if (button == 5) {
                   /* wheel down */
-                  relative_seek (play, -0.01);
+                  relative_seek (play, -0.04);
                 }
               }
               break;
@@ -1466,9 +1466,9 @@ keyboard_cb (const gchar * key_input, gp
       break;
     default:
       if (strcmp (key_input, GST_PLAY_KB_ARROW_RIGHT) == 0) {
-        relative_seek (play, +0.08);
+        relative_seek (play, +0.04);
       } else if (strcmp (key_input, GST_PLAY_KB_ARROW_LEFT) == 0) {
-        relative_seek (play, -0.01);
+        relative_seek (play, -0.04);
       } else if (strcmp (key_input, GST_PLAY_KB_ARROW_UP) == 0) {
         play_set_relative_volume (play, +1.0 / VOLUME_STEPS);
       } else if (strcmp (key_input, GST_PLAY_KB_ARROW_DOWN) == 0) {