Floss: Update filter policy based on MSFT filters

* When MSFT filter is used, scan parameter's filter policy should be
  "ignore not in accept list".
* When there is at least one scanner that doesn't use filter, filter
  policy should be "accept all advertisements".

Bug: 265215220
Tag: #floss
Test: Manual - Tested with btclient and chrome-btclient

Change-Id: I1c1c5e39dcefdd1ee8c5da5d27cdde52570418d0