[machine list] always loads "All" when loading "My Machines" even if another tab was pressed before closing it

[CSchank]

Current filter selection can become out of sync with what's shown.

Steps to reproduce:

1. While logged in, open "My Machines."
2. Go to a screen other than "All".
3. Close "My Machines."
4. Open it again.
5. "All" is loaded, even though another tab seems to be selected.

Possible fixes: 1) always load all (reset to correct tab), 2) load the proper one, persisting the tab. I like option 2) better, since the user might want to stay on the same tab.