MPV: Try the same commands as in lektord to close mpv to try to solve #5

src/UI/DocumentViews/MpvContainer.cc

@@ -87,8 +87,9 @@ MpvContainer::closeMpv() noexcept
         qDebug() << "Closing the MPV context";
         registerMpvTimeCallback(nullptr);
         registerMpvDurationCallback(nullptr);
+        asyncCommand(AsyncCmdType::None, { "quit", nullptr });
         mpv_wait_async_requests(mpv);
-        mpv_terminate_destroy(mpv);
+        mpv_destroy(mpv);
         mpv                     = nullptr; // Stop all other callbacks here
         isMpvAlreadyInitialized = false;   // De-init
     }