nimble/host: Fix error return in `ble_store_util_bonded_peers`
nimble/host: Fix error return in `ble_store_util_bonded_peers`

- When `max_peer`(input parameter) is less than stored bonds,
  `ble_store_util_bonded_peers` returns `BLE_HS_ENOMEM` status code
  unnecessarily. It results in non deletion of oldest bond when
  `ble_gap_unpair_oldest_peer` is called.

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble