btif_a2dp: Incorrect check for A2DP Offload Start status

Bug: 350899760
Flag: EXEMPT, minor fix
Test: m com.android.btservices
(cherry picked from https://android-review.googlesource.com/q/commit:dcd2adf7f6b3de3583322b26b8af37f385ec3436)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:76dd3bec0a24833c8aa8d6264316c5f40e313342)
Merged-In: I00b09b7fe6a540a37ba721a71da090e815885c1a
Change-Id: I00b09b7fe6a540a37ba721a71da090e815885c1a