BQ: Resend queued buffer handles after disconnect

When the producer disconnects from a BufferQueue, all of its slots are
cleared and buffers in the queue are marked as stale. When the slots
are cleared, we notify the consumer that buffers were released so that
it can clear its cache of slot-to-buffer mappings.

However, when we were marking queued buffers as stale, we were not
clearing the bit that dictates whether the BQ needs to send a buffer
handle upon acquire, so in the case where the producer queues a buffer
and disconnects, and then the consumer acquires that queued buffer,
the consumer doesn't get the buffer handle, nor can it retrieve it from
its cache, because it has (or should have) already cleared it.

This change clears that bit upon disconnect.

Bug: 36453246
Test: New test in libgui_tests + Vulkan CTS test from bug
Change-Id: Ic27f119a4164878257c3841b4e1d421694159774