Modifies the openEditJobView function, so that it disables the cancel…

… button of the settings view.

If the user clicks the cancel button while editing a job, then the job is erased due to the way jobs have to be added/removed from the view's list and the model.

src/controller/MainController.java

@@ -178,6 +178,7 @@ private void openEditJobView() {
         model.getJobs().remove(job.getName());
         view.getJobsList().getSelectionModel().clearSelection();
 
+        controller.getView().getButton_cancel().setDisable(true);
         sceneManager.swapToNewScene(controller);
     }