Refactor: Fix BT device name length issue

BT device name only show 247bytes on settings, it supposed to show
248bytes if local device and remote device have 248bytes' name.
Increasing the argument passed to function strlcpy&memcpy bt 1
will resolve the issue.

Tag: #refactor
Bug: 162480697
Sponsor: mylesgw
Test: cert/run --host
Change-Id: Ib3fa7d78e39f0a9330658f9ce2b4a67003d7114d