Import projects dialog always import all projects

Try this code
```java
		ExternalProjectImportWizardDialog w = new ExternalProjectImportWizardDialog();
		w.open();
		WizardProjectsImportPage p1 = w.getFirstPage();
		p1.setRootDirectory(dir);
		p1.deselectAllProjects();
		p1.selectProjects("p1");
		p1.copyProjectsIntoWorkspace(true);
		w.finish();
```
all project are imported but only p1 should be