Fix scan issue if driver supported MaxScanSSID less then 4

Fix scan issue if driver supported MaxScanSSID less then 4

	When enable Wi-Fi technology, fast scan will transfer favourite
network to scan. if the default MaxScanSSID is 4 and the number of
local favourite network is bigger than driver support MaxScanSSID,
which will result in scaning block.
	Here change it to 1, it will work well with mass Wi-Fi driver,
at same time it doesn't affect the hidden netwrok autoconnet.