Use toStdU16String when converting string to std::filesystem::path

qUtf16Printable causes a crash in linux.

Pick-to: 6.8.0 6.8 6.7
Fixes: QTBUG-129375
Change-Id: Icb0aed74e0a2af762aee464d52a63e0f847b85a9
Reviewed-by: Pasi Petäjäjärvi <pasi.petajajarvi@qt.io>

src/plugins/tracing/qctflib.cpp

@@ -186,7 +186,7 @@ QCtfLibImpl::QCtfLibImpl()
 void QCtfLibImpl::clearLocation()
 {
 #if QT_CONFIG(cxx17_filesystem)
-    const std::filesystem::path location{qUtf16Printable(m_location)};
+    const std::filesystem::path location{m_location.toStdU16String()};
     for (auto const& dirEntry : std::filesystem::directory_iterator{location})
     {
         const auto path = dirEntry.path();