Remove double quote from AP key from a WifiConfiguration

Double quotes from the WifiConfiguration SSID led to APs not being
matched to their respective configs by key, resulting in a saved AP
entry in the wifi picker behaving like an unsaved network.

Bug: 123062494
Test: manual, build and tap on saved network
Change-Id: Ife56e34b7efe02420dd79f983c485c4aa619e949