app/wm_test: fix signal overwrite in wm_test onoff
app/wm_test: fix signal overwrite in wm_test onoff

if priority of wifi msg handler is higher than wm_test and
events(connect--> disconnect) happens quickly then sending events to
the main app by global variable has error. In following case
1) Event1 : G(global variable) == connect_success
2) Event2 : G == connect_fail
3) Main App: handle connect_fail
So queuing events are more stable.

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