luci-base: network.js: ignore wireless ifname patterns on retrieving devices

Only treat the given identifier as Linux netdev name if we can find a
corresponding entry in the device info cache and do not consider strings
starting with "wlan", "ath" or "wl" to be existing devices.

This fixes incorrectly adding wireless sections as ifnames to network
interfaces when the wifi-iface section name begins with one of the
`iface_patterns_wireless` patterns.

Fixes: #5069
Signed-off-by: Jo-Philipp Wich <jo@mein.io>