AMMEX: keep focus on planned transactions

[jeepcook]

When we are in planned transactions menu, select a transaction and do a back, the "focus" is not registered so we have on the screen the first transaction and others following the first one. not the same screen as previous one.

The fix should be to implement the same functionality as the one used for accounts which go back to the same previous screen as the one seen before opening a transaction.

AMMEX 20240509-1032