Remove flag for bta_av_setconfig_rej_type_confusion

The flag has been soaked in Nextfood for more than a month.

Bug: 260230151
Bug: 341754333
Bug: 315241296
Test: m libbluetooth
Ignore-AOSP-First: security
Tag: #security
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:286538b8e52dbb8efd26ccdb240949ffeb3ad2b5)
Merged-In: I4a7a97196e0949960856183e6899a9fc4d7b4d44
Change-Id: I4a7a97196e0949960856183e6899a9fc4d7b4d44