plan page should not use date from data object of plan

[yaelal]

singleplan.jsx uses plan.data.LAST_UPDATE
since we cannot and should not count of that field's date format we should not use it
use instead plan.last_visited_status

[yaelal]

<li> עדכון אחרון:{" "} <Moment parse="YYYYMMDDHHmm" format="DD/MM/YYYY" > {plan.data.LAST_UPDATE} </Moment> </li>