StringGrid mediator was missing SetActive() implementation.
StringGrid mediator was missing SetActive() implementation.

This meant ClearList was never called anywhere.
ClearList() was also slightly incorrect in the ListView mediator.

wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI,wkitty42/fpGUI