Make events start on 00:00 (12:00 a.m.)

There is absolutely no reason to make events start on noon, 12:00.
Switching to 00:00 seems totally reasonable here, and makes event
handling a bit easier, also.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/apoint.c

@@ -254,7 +254,7 @@ apoint_add (void)
         }
       else
         (void)event_new (item_mesg, 0L,
-                         date2sec (*calendar_get_slctd_day (), 12, 0), Id);
+                         date2sec (*calendar_get_slctd_day (), 0, 0), Id);
 
       if (hilt == 0)
         hilt++;