runTask: Correct variable name

vars/runTask.groovy

@@ -63,12 +63,13 @@ def call(String task, String branch, String repo, String phpversion, String data
 
                     echo "${env.PATHTORUNNER}"
                     echo "${moodleversion}"
+                    echo "${runner}"
                 }
             }
 
             stage("Run Task") {
                 steps {
-                    sh "${pathtorunner}/run.sh"
+                    sh "${runner}/run.sh"
                 }
             }