Martin Brennan 206d8db433
FIX: Invalid Date on "last" shortcut for timer + bookmarks (#12783)
The "last custom date and time" shortcut for the topic timer and
bookmarks could get into a state where it had an Invalid Date if
the user opened the topic timer modal, clicked Custom Date and then
closed the modal without making changes. This has been fixed, the
last custom date + time will no longer be set in this case and if
somehow the last custom date + time is invalid that option will not
show.

Also improve the wording from just "Last" to "Last custom datetime"
2021-04-22 09:26:31 +10:00
..