Make Space in FileChooser refresh the file list

The Space command in FileChooser should actually re-read the directory
and not just redraw the current (possibly stale) data. This is
especially useful in two situations:
1. You have extracted some attachments in the current directory
2. You wish to see the current state of the Last Documents list.

filechooser.lua

@@ -294,9 +294,10 @@ end
 function FileChooser:addAllCommands()
 	self.commands = Commands:new{}
 
-	self.commands:add({KEY_SPACE}, nil, "Space",
-		"refresh page manually",
+	self.commands:add(KEY_SPACE, nil, "Space",
+		"refresh file list",
 		function(self)
+			self:setPath(self.path)
 			self.pagedirty = true
 		end
 	)