floss: pandora: fix host.Connect

Only wait for bonded if security.OnPairing is not called before
host.Connect. Otherwise, host.Connect will block the caller.

Bug: 320397610
Tag: #floss
Test: m Bluetooth && pts-bot L2CAP/COS/CED/BV-01-C
Test: pts-bot L2CAP/COS/CFD/BV-08-C
Flag: EXEMPT floss only changes
Change-Id: I04a70471f3ddad1fd8e177e67ef6c2776c77535e