Fix #9293: Issue with the native load/save dialog (#9294)

Do not set OpenRCT2 as the owner of the file dialog so that it has its own taskbar button and can be independently focused.

src/openrct2-ui/UiContext.Win32.cpp

@@ -109,7 +109,6 @@ namespace OpenRCT2::Ui
             // Set open file name options
             OPENFILENAMEW openFileName = {};
             openFileName.lStructSize = sizeof(OPENFILENAMEW);
-            openFileName.hwndOwner = GetHWND(window);
             openFileName.lpstrTitle = wcTitle.c_str();
             openFileName.lpstrInitialDir = wcInitialDirectory.c_str();
             openFileName.lpstrFilter = wcFilters.c_str();