(legacy) crashreport strpos() expects parameter 1 to be string, array given in /usr/local/www/firewall_rules_edit.php on line 747

Spotted by: @fabianfrz

o Page did not work with translations.
o Selected serial device wasn't shown.
o Very old gpsport migration code zapped.
o set_gps_default() must trigger on load.

This brings us down from 2.2 seconds to 0.2 seconds reload time
*without* the obscure caching in place.  This will likely solve
the filter reload issues that some people had.  :)