Merge #828: Rendering an amp characters in the wallet name for QMenu

8233ee4 gui: correct replacement of amp character in the wallet name for QMenu (Konstantin Akimov)

Pull request description:

  In the current implementation Qt uses '&' as a signal to underscore letter and use it as a hot-key, which is not expected for case of wallet name.

  The [comment in the code](https://github.com/bitcoin/bitcoin/pull/30446/files#diff-2ecf8cbf369cf3d2f3d2b1cf5cfe4c1a647d63e11e2885d2fd0ac11fb5f7a804L402-L404) regarding the use of an "&" on a menu item is misleading.
  If a wallet name has an "&" in it, it is not supposed to be interpreted as a hot-key, but it should be shown as it is without replacing it to an underscore.

  See screenshots before & after:
  ![Screenshot_20240713_122454](https://github.com/user-attachments/assets/e36d6e4c-d872-4b4c-b55e-bcfde9881281)
  ![Screenshot_20240713_131304](https://github.com/user-attachments/assets/9484687d-0aea-4061-a461-5d187762a4b4)

ACKs for top commit:
  hebasto:
    re-ACK 8233ee4.
  pablomartin4btc:
    tACK 8233ee4
  BrandonOdiwuor:
    ACK 8233ee4. Tested on Ubuntu 22.04 using Qt version 5.15.3

Tree-SHA512: 918c2c05555d203a8b203794c138651d4a1691a05a858631d5a4664b78e150402d1ae4a02ee5181f63a5b22a09badca0a4ea14a626f45f8cbe557226c308b8c5

Author: hebasto

src/qt/bitcoingui.cpp

@@ -399,10 +399,9 @@ void BitcoinGUI::createActions()
             for (const std::pair<const std::string, bool>& i : m_wallet_controller->listWalletDir()) {
                 const std::string& path = i.first;
                 QString name = path.empty() ? QString("["+tr("default wallet")+"]") : QString::fromStdString(path);
-                // Menu items remove single &. Single & are shown when && is in
-                // the string, but only the first occurrence. So replace only
-                // the first & with &&.
-                name.replace(name.indexOf(QChar('&')), 1, QString("&&"));
+                // An single ampersand in the menu item's text sets a shortcut for this item.
+                // Single & are shown when && is in the string. So replace & with &&.
+                name.replace(QChar('&'), QString("&&"));
                 QAction* action = m_open_wallet_menu->addAction(name);
 
                 if (i.second) {