If there is many GATT users, Android sends indication to all the users
and expects confimation.
Without this fix, we could endup sending multiple Confirmation to remote
device on single Indication - which is wrong.

This patch fixes this.
Found during PTS HAP testing.

Bug: 238171211
Test: atest BluetoothInstrumentationTests
Test: PTS
tag: #feature
Change-Id: Ieef9a0f3448ce8529624e777282e857a7f206c00