ExerciseDockerCompose => Bug fix on docker down (wrong --rmi option usage)

helpers/Dojo/ExerciseDockerCompose.ts

@@ -130,7 +130,7 @@ class ExerciseDockerCompose {
 
                             this.log('####################################################### Stop and remove containers #######################################################\n', false, false);
 
-                            const dockerCompose = spawn(`${ dockerComposeCommand } down --volumes --rmi`, {
+                            const dockerCompose = spawn(`${ dockerComposeCommand } down --volumes`, {
                                 cwd  : this.executionFolder,
                                 shell: true
                             });