Fix pane with double digit ID not showing in list

[twidxuga]

This fixes a bug by which if the digit(s) of the current pane's ID (e.g. %1) correspond to the prefix digit(s) of the target's ID (e.g. %14), then the target pane will not be shown in the list, and therefore cannot be chosen, frustrating attempts to send text/keys to that target pane.

Thanks for this excellent plug-in!