Fix strlcpy length passing in bta hl

In struture tBTA_HL_API_UPDATE & tBTA_HL_API_REGISTER both
have XXX_LEN + 1 in the arry defination. When passing XXX_LEN,
strlcpy will max copy XXX_LEN - 1 and when the real string len
reach the XXX_LEN , the last char will be unexpected filled
with /0

Test: build & unittest
Change-Id: Ib6ccb9c40196ca84ee9e10556820e36a6dde0d35