wirelessclient.cgi: Fix for bug #12571

wirelessclient.cgi: Fix for bug #12571

- Wirelessclient shows priority 0 to be most preferred and priority 4 as
least preferred. Based on forum posters experience and the wpa_supplicant
man page it is the other way round.
- This patch moves the least preferred title to priority 0 and vice versa
- Will ask bug reporter to test out the patch and confirm it works. The page
is only shown if you have a wifi connection on red.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>