Move: keep the date of the note

[tetrian_vaz3yg6b0bwks7da]

When using the 'move' function, the time of the note is kept but the date is changed to today.

[gagik]

This was somewhat intentional way of making the move more visible (since an old date might end up burried in depths of messages) but I agree this can be not what one expects from moving messages; it'd make sense to let the date be preserved