ttcn3/tmux/ttcn3-bts-test.sh: fix copy-pasted TRX names

Change-Id: I5959acdf07caa1e9003662b0c11c3df68ca933fe
diff --git a/ttcn3/tmux/ttcn3-bts-test.sh b/ttcn3/tmux/ttcn3-bts-test.sh
index 78acad9..e506071 100755
--- a/ttcn3/tmux/ttcn3-bts-test.sh
+++ b/ttcn3/tmux/ttcn3-bts-test.sh
@@ -48,7 +48,7 @@
 tmux send-keys -t $SESSION:1.2 "cd $OBB_DIR/src/target/trx_toolkit" C-m
 tmux send-keys -t $SESSION:1.2 "./fake_trx.py \
 					--trx TRX1@127.0.0.1:5700/1 \
-					--trx TRX1@127.0.0.1:5700/2 \
-					--trx TRX1@127.0.0.1:5700/3" C-m
+					--trx TRX2@127.0.0.1:5700/2 \
+					--trx TRX3@127.0.0.1:5700/3" C-m
 
 tmux attach -t $SESSION:0