Update the cheats list after adding a new cheat from the Game Genie window. With
this change, the new cheat is shown immediately in the cheats window, if it's
open.
Fix an issue where the cheats list isn't always immediately updated after a
change. For example, clicking Add while an item is already selected might not
show the item until some other user action is taken. This change updates the
cheats list QTreeWidget viewport explicitly after making changes to its items.
This causes changes to be shown immediately.
Remove unused GuiCheatsDialog_t::actvCheatRedraw member.
Fritz Mahnke