[WifiTrackerLib] Use SSID as title for Osu entries with no friendly name

OsuProviders with null friendly name is a possible scenario that could
crash Wifi Settings. If the friendly name is not available, default to
the SSID and then to the server uri if needed.

Bug: 160748340
Test: manual visual verification that SSID appears as title if friendly
name is hardcoded as null.

Change-Id: I8f2b1b7a5a2c12d1c1ad43a9e8f786016355c2c1
(cherry picked from commit f02e7c63519548630221badd760651d55bbb99cb)
Merged-In: I8f2b1b7a5a2c12d1c1ad43a9e8f786016355c2c1
1 file changed