qt: Fix DLL version in cmake config files

* lang/qt/src/QGpgmeConfig-w32.cmake.in.in,
lang/qt/src/QGpgmeQt6Config-w32.cmake.in.in: Fix name and path of DLL.

• Co-authored-by: Biswapriyo Nath <nathbappai@gmail.com>
• Signed-off-by: Ingo Klöcker <dev@ingo-kloecker.de>