Fixed bug on test value of no_checkout and rebuild_last_id

jenkins/user_launch.sh

@@ -16,9 +16,17 @@ set_common
 
 get_configs_folder --dest-dir "configs"
 
+if [ "${rebuild_last_id}" == "true" ] ; then
+    {rebuild_last_id_opt="--rebuild-last-id"
+fi
+
+if [ "${no_checkout}" == "true" ] ; then
+    no_checkout_opt="--no-checkout"
+fi
+
 manage_user_launch \
     "${flavour}" \
     "${slots}" \
     ${slot_build_id:+--slot-build-id "${slot_build_id}"} \
-    ${rebuild_last_id:+--rebuild-last-id} \
-    ${no_checkout:+--no-checkout}
+    ${rebuild_last_id_opt} \
+    ${no_checkout_opt}