fix(plantuml-cli): fix container test script

Test now display PlantUML version.

Author: evantill

plantuml-cli/rootfs/data/container-test.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 set -euo pipefail
 
-plantuml --version
+plantuml -version
 
 plantuml -testdot