Wizard: Start sorting Wi-Fi networks based on signal strength

[JamiKettunen]

Currently the found wireless networks are alphabetically sorted but intuitively with many networks around the one you're most likely interested in will be with the highest signal strength as you'll be nearby it so that should be at the top of the list.

Screenshot of current behavior (without network names, you can probably still guess which of those is my home Wi-Fi :p):