wifitoggle: don't assume option disabled to be present (#9750)

git-svn-id: svn://svn.openwrt.org/openwrt@35415 3c298f89-4303-0410-b956-a3cf2f4a3e73
wifitoggle: merge r35415

git-svn-id: svn://svn.openwrt.org/openwrt@35416 3c298f89-4303-0410-b956-a3cf2f4a3e73