Qt: Fix "open wiki" option not using the wiki redirect script

The dolphin-redirect.php script seems to have been present since 2012
at least, but we accidentally stopped using it when the "open wiki"
feature was reimplemented in DolphinQt2 in 2016.

    <@delroth> dolphin-redirect.php is slightly smarter and tries to find gameid aliases for e.g. same region
    <@delroth> uh, I mean different region

Source/Core/DolphinQt/GameList/GameList.cpp

@@ -503,7 +503,8 @@ void GameList::OpenWiki()
     return;
 
   QString game_id = QString::fromStdString(game->GetGameID());
-  QString url = QStringLiteral("https://wiki.dolphin-emu.org/index.php?title=").append(game_id);
+  QString url =
+      QStringLiteral("https://wiki.dolphin-emu.org/dolphin-redirect.php?gameid=").append(game_id);
   QDesktopServices::openUrl(QUrl(url));
 }