WASAPI: fix handle leak in mmcss scheduling


We need to revert the scheduling characteristics with
AvRevertMmThreadCharacteristics to fix leaks of handles.

Fixes: QTBUG-151655
Pick-to: 6.12
Change-Id: I390be846e793d4f4ea13c0e23c6cecc36a39f5bd
Reviewed-by: Mikko Hallamaa <mikko.hallamaa@qt.io>
commite365857fcf92a28108a27bf48d0cecd53d7c855a
parent52b1a0c62af5fd57b4176859033d994064482a72
authorTim Blechmann <tim.blechmann@qt.io>
committerTim Blechmann <tim.blechmann@qt.io>
commit timeTue, 20 Oct 2026 10:20:25 +0000