[snappymail] Allow deletion of parent folder with subfolders

This change brings snappymails behaviour in line with RFC3501, section 6.3.4,
by allowing "real" (i.e. non-\Noselect) parent folders to be deleted and
by not performing a recursive deletion of subfolders.

dev/Settings/User/Folders.js

@@ -98,7 +98,7 @@ export class FoldersUserSettings {
 					if (folderToRemove === folder) {
 						return true;
 					}
-					folder.subFolders.remove(fRemoveFolder);
+					//folder.subFolders.remove(fRemoveFolder);
 					return false;
 				};