Fix table sorting on current reservations page

[orenyk]

Similar to #1378, the sorting on /reservations/current/:id doesn't really make sense. It looks like it's just sorting by reservation ID, but really future reservations should be sorted by start date, in ascending order, and checked out reservations should be sorted by checkout time, in descending order. Should be easy, let's bundle it in v6.0.0.

[zeffman]

this is sorting correctly for me on master

[zeffman]

[orenyk]

You're right, we fixed this in #1378. Good catch, closing.