Dismiss TOFU dialog when the corresponding wifi entry is forgotten

Currently TOFU dialog is not dismissed when the corresponding wifi entry
is actually forgotten.

Add maybeDismissTofuDialog to InsecureEapNetworkHandler and call it in
the network update listener when network is removed by user clicking
forget.

Bug: 262456737
Test: atest InsecureEapNetworkHandlerTest
Change-Id: I88907dd32320e811004ec690da1a35a9856936f4
3 files changed