Shift+tab works in equipment window to switch betwen controls

git-svn-id: http://svn.net-core.org/repos/t-engine4@5638 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/dialogs/ShowStore.lua

@@ -107,6 +107,9 @@ function _M:init(title, store_inven, actor_inven, store_filter, actor_filter, ac
 			end
 		end,
 	}
+	self.key:addCommands{
+		[{"_TAB","shift"}] = function() self:moveFocus(1) end,
+	}
 	self.key:addBinds{
 		EXIT = function() game:unregisterDialog(self) end,
 	}