Fix Icon usage of local overlay in Wi-Fi

The Icon overlay was moved/replicated to be internal to Wi-Fi. However,
the usage of the icon overlay ID was through a global context. Convert
usage of the icon ID to use the correct local context (which can then
find the icon resource).

Bug: 147070048
Bug: 146806921
Bug: 146899658
Test: atest com.android.server.wifi
Test: CtsVerifier Suggestion tests
Test: manual - associate with bad Wi-Fi - observe notification
Change-Id: I77ec825d33d3589d80112a85e554dca8ffcdc955
7 files changed