Don't remove the bond when LE encryption refresh fails

LE central device refreshes the encryption if SMP Security request is received for an already encrypted link. If encryption refresh fails for any reason, SMP generates an SMP_COMPLT_EVT event with failure. This event should not remove the bond.

Change-Id: I68aee5c32e329ca3b2151e2b0ac28f7b35b367bd
Test: mmm packages/modules/Bluetooth
Flag: com.android.bluetooth.flags.le_encryption_refresh_failure_handling
Bug: 384509717
Bug: 393396710