gs-plugin-loader: Inherit list properties when replacing it

When running refine on a subset of the apps returned by a plugin action, the original list is discarded and replaced with the new refined list. The problem is that the discarded list has set important properties, like whether it had been randomized, truncated or how many max items the list had so far.

These properties are usable for example when search for the apps, thus inherit them before discarding the original list.