ttcn3-pcu-test/sns: fix PCUIF version number (follow up patch)
Unfortunately we had to revert [1] because it worked for current master but not for latest. The mistake here was to change the PCUIF version number in PCU_Tests.cfg to PCUIF v12. This is indeed the correct version for current master, but latest still uses v11. Also the change we made in jenkins-sns only affected 2023q1 builds, it does not affect latest. This is the reason why the previous patch broke latest.
This follow up patch now copies the approach we already successfully use with the normal ttcn3-pcu-test / ttcn3-pcu-test-latest. (see also jenkins.sh)