PDA NanoUI Optimizations.

Since we no longer have to send data on first UI view we can remove those
checks and only look at the data we need to send when we need to send it.

Also fixed a couple of the links on the status display function.

Conflicts:
	code/game/objects/items/devices/PDA/PDA.dm
	code/game/objects/items/devices/PDA/cart.dm