winecfg: Add owner to file picker dialogs, making them modal.

programs/winecfg/appdefaults.c

@@ -326,7 +326,7 @@ static void on_add_app_click(HWND dialog)
   static const WCHAR pathC[] = { 'c',':','\\',0 };
 
   OPENFILENAMEW ofn = { sizeof(OPENFILENAMEW),
-		       0, /*hInst*/0, 0, NULL, 0, 0, NULL,
+		       dialog, /*hInst*/0, 0, NULL, 0, 0, NULL,
 		       0, NULL, 0, pathC, 0,
 		       OFN_SHOWHELP | OFN_HIDEREADONLY | OFN_ENABLESIZING,
                        0, 0, NULL, 0, NULL };

programs/winecfg/theme.c

@@ -635,7 +635,7 @@ static void on_theme_install(HWND dialog)
       title, sizeof (title) / sizeof (title[0]));
 
   ofn.lStructSize = sizeof(OPENFILENAMEW);
-  ofn.hwndOwner = 0;
+  ofn.hwndOwner = dialog;
   ofn.hInstance = 0;
   ofn.lpstrFilter = filter;
   ofn.lpstrCustomFilter = NULL;