Fix File/New in the deployment folders.

That is tell the user that those files need not be added to any project,
and show "<Implicitly Add>" for them on the last wizard page.
This fixes Add/New for the QML/OTHER_FILES folder structure, except for
the virtual folder itself.

Reviewed-By: Jarek Kobus <jaroslaw.kobus@nokia.com>

src/plugins/genericprojectmanager/genericprojectnodes.cpp

@@ -174,7 +174,8 @@ QList<ProjectExplorer::ProjectNode::ProjectAction> GenericProjectNode::supported
 {
     Q_UNUSED(node);
     return QList<ProjectAction>()
-        << AddFile
+        << AddNewFile
+        << AddExistingFile
         << RemoveFile;
 }