Prevent removelist from deleting a fileless dir if it contains subdirs

The presence of files in these subdirs is checked earlier by the program.

src/server/campaignd/addon_utils.cpp

@@ -178,7 +178,7 @@ bool data_apply_removelist(config& data, const config& removelist)
 		}
 	}
 
-	return data.has_child("file");
+	return data.has_child("file") || data.has_child("dir");
 }
 
 void data_apply_addlist(config& data, const config& addlist)