qt: Fix license headers of CMake config files
* lang/qt/src/QGpgmeConfig-w32.cmake.in.in, lang/qt/src/QGpgmeConfig.cmake.in.in, lang/qt/src/QGpgmeConfigVersion.cmake.in: Files are part of QGpgME. Fix copy&paste error (GPGME-CL -> QGpgME). Fix reference to license to check for details. * lang/qt/src/QGpgmeQt6Config-w32.cmake.in.in, lang/qt/src/QGpgmeQt6Config.cmake.in.in, lang/qt/src/QGpgmeQt6ConfigVersion.cmake.in: Files are part of QGpgME. Fix reference to license to check for details.
The files were already licensed under the GPL but the license headers
contained multiple (copy&paste?) errors.