last: make its output more like "standard" last (aka "fancy last").

last: make its output more like "standard" last (aka "fancy last").
The main difference is that LOGIN lines are still shown by non-fancy one.

function                                             old     new   delta
static._ut_usr                                         -      26     +26
last_main                                            448     471     +23
static._ut_lin                                         -       7      +7
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(add/remove: 2/0 grow/shrink: 1/0 up/down: 56/0)               Total: 56 bytes