sysmo-usim-tool.sjs1: Add option -I --set-iccid to help

The helptext lacks the option -I

Change-Id: I25958cedb7d084aedf68f1a56e473098f88ac754
Related: OS#3376

sysmo-usim-tool.sjs1.py

@@ -53,6 +53,7 @@ def helptext():
 	print "   -K, --set-ki ................... Set KI value"
 	print "   -s  --seq-parameters ........... Show MILENAGE SEQ/SQN parameters"
 	print "   -S  --reset-seq-parameters...... Reset MILENAGE SEQ/SQN parameters to default"
+	print "   -I, --set-iccid ................ Set ICCID value"
 	print ""