WifiStateMachineTest: remove looper race

Two WifiStateMachineTest tests had a slight race when sending extra
messages to WSM after setting up the test condition.  This CL removes
the extra mode message + internal state check.

Bug: 37358048
Test: frameworks/opt/net/wifi/tests/wifitests/runtests.sh
Change-Id: I71356679d67ae2aafd68372ee75eff24af29eaf7
1 file changed