tests/gsup_test.c: drop session IEs from MO-ForwardSM Error

Both session state and session ID IEs were left from the initial
version of Ibe325c64ae2d6c626b232533bb4cbc65fc2b5d71. There is
no need to use them (as we use SM-RP-MR), so let's clean up.

Change-Id: I0d910b87f15ffbc0aeeca9cb4fcbef32bdf3ef88
diff --git a/tests/gsup/gsup_test.err b/tests/gsup/gsup_test.err
index 73b35fc..225735e 100644
--- a/tests/gsup/gsup_test.err
+++ b/tests/gsup/gsup_test.err
@@ -58,8 +58,8 @@
   generated message: 2a 01 08 21 43 65 87 09 21 43 f5 40 01 fa 43 04 de ad be ef 
   original message:  2a 01 08 21 43 65 87 09 21 43 f5 40 01 fa 43 04 de ad be ef 
   IMSI:              123456789012345
-  generated message: 25 01 08 21 43 65 87 09 21 43 f5 30 04 de ad be ef 31 01 03 40 01 fa 44 01 af 
-  original message:  25 01 08 21 43 65 87 09 21 43 f5 30 04 de ad be ef 31 01 03 40 01 fa 44 01 af 
+  generated message: 25 01 08 21 43 65 87 09 21 43 f5 40 01 fa 44 01 af 
+  original message:  25 01 08 21 43 65 87 09 21 43 f5 40 01 fa 44 01 af 
   IMSI:              123456789012345
   generated message: 2c 01 08 21 43 65 87 09 21 43 f5 46 01 02 
   original message:  2c 01 08 21 43 65 87 09 21 43 f5 46 01 02 
@@ -93,7 +93,7 @@
   message 17: tested 33 truncations, 29 parse failures
   message 18: tested 44 truncations, 39 parse failures
   message 19: tested 20 truncations, 18 parse failures
-  message 20: tested 26 truncations, 22 parse failures
+  message 20: tested 17 truncations, 15 parse failures
   message 21: tested 14 truncations, 13 parse failures
   message 22: tested 22 truncations, 21 parse failures
   message 23: tested 14 truncations, 13 parse failures
@@ -119,7 +119,7 @@
   message 17: tested 8448 modifications, 2053 parse failures
   message 18: tested 11264 modifications, 2307 parse failures
   message 19: tested 5120 modifications, 1031 parse failures
-  message 20: tested 6656 modifications, 1546 parse failures
+  message 20: tested 4352 modifications, 1030 parse failures
   message 21: tested 3584 modifications, 771 parse failures
   message 22: tested 5632 modifications, 771 parse failures
   message 23: tested 3584 modifications, 770 parse failures