Force use and update the job name with the loaded project file

CURA-4348

- If no project is loaded beforehand and then a model file is loaded,
  the job name should be determined with the current machine name and
  the first loaded model name.
- If a project is loaded, the job name should be the same as the project
  name, and it should not change until another project is loaded.

resources/qml/OpenFilesIncludingProjectsDialog.qml

@@ -36,8 +36,6 @@ UM.Dialog
 
         var meshName = backgroundItem.getMeshName(projectFile.toString());
         backgroundItem.hasMesh(decodeURIComponent(meshName));
-        // always update the job name with the loaded project
-        PrintInformation.setBaseName(meshName);
     }
 
     function loadModelFiles(fileUrls)