jobs: osmo-gsm-tester_ttcn3: Fix path to jenkins script

There was a directry refactoring a few weeks ago in osmo-gsm-tester and
this path was not updated correctly.

Change-Id: I580cd9d4a602b3ed1839fb0990ac3816c5e42cbe

jobs/osmo-gsm-tester_ttcn3.sh

@@ -11,4 +11,4 @@ unlink osmo-gsm-tester/sysmocom/ttcn3/resources.conf || true
 ln -s resources.conf.prod osmo-gsm-tester/sysmocom/ttcn3/resources.conf
 
 PATH="$PWD/osmo-gsm-tester/src:$PATH" \
-  ./osmo-gsm-tester/ttcn3/jenkins-run.sh
+  ./osmo-gsm-tester/sysmocom/ttcn3/jenkins-run.sh