Fix connect fail when bonding then connect

[Root Cause]
when it's connecting an non-connectable device, app connect
 to it again. and the l2cap statue indicates there is a lcb
 for the address. then it return true to notify gatt connected
 and it will cancel the connect timer. the connection will not
 timeout and the smp flag will be always paring.

[Solution]
we should return false when it's connecting.

Bug: 265983604
Test: atest net_test_btif_stack pass

Change-Id: I8c5ca19d634d5ecee3dfcb8e5def3eaefa22ca99