Sort experiments by whether that have winner and that's name at Experiment#all_active_first

Experiment#all_active_first returns experiments in random order.
It's useful for us that the method returns them sorted by active and name.

--- before ---
hoge4 (active)
hoge2 (active)
hoge1
hoge5
hoge3

--- after ---
hoge2 (active)
hoge4 (active)
hoge1
hoge3
hoge5