osmo-remsim-latest: fix apt install command
Adjust to the renamed subpackage in the "apt install" command to fix:
E: Unable to locate package osmo-remsim-client
Related: osmo-remsim I6c634572af5036fd7f9ce1fee6d1474e06bdaa5a
Related: https://jenkins.osmocom.org/jenkins/view/TTCN3/job/ttcn3-remsim-test-latest/253/console
Change-Id: I349111f4dd968f8e4de9598cc35aa99df221e06b
