Merge dashpay#5995: fix(qt): tab switching via shortcuts doesn't work after 5986

c874205 fix(qt): tab switching via shortcuts doesn't work after 5986 (UdjinM6)

Pull request description:

  ## Issue being fixed or feature implemented
  Looks like 3265b54 (dashpay#5986) broke it

  ## What was done?

  ## How Has This Been Tested?
  run dash-qt, try using shortcuts `cmd+1`, `cmd+2` etc. (on macos)

  ## Breaking Changes
  n/a

  ## Checklist:
  - [x] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [ ] I have added or updated relevant unit/integration/functional/e2e tests
  - [ ] I have made corresponding changes to the documentation
  - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  PastaPastaPasta:
    ACK c874205
  kwvg:
    ACK c874205

Tree-SHA512: 62a593ec804d75ff8aada0ef9ea90106adbf8cd11b202a6296086f55c2a4d2181e56dc8e56193a0ed49d94e55ee3236ab441ab477c8ca6d7b0c649dff987dbbc

Author: PastaPastaPasta

src/qt/guiutil.cpp

@@ -1612,14 +1612,14 @@ void updateButtonGroupShortcuts(QButtonGroup* buttonGroup)
         return;
     }
 #ifdef Q_OS_MAC
-    auto modifier = Qt::CTRL;
+    auto modifier = "Ctrl";
 #else
-    auto modifier = Qt::ALT;
+    auto modifier = "Alt";
 #endif
-    int nKey = 0;
+    int nKey = 1;
     for (auto button : buttonGroup->buttons()) {
         if (button->isVisible()) {
-            button->setShortcut(QKeySequence(static_cast<int>(modifier) | static_cast<int>(Qt::Key_1) | nKey++));
+            button->setShortcut(QKeySequence(QString("%1+%2").arg(modifier).arg(nKey++)));
         } else {
             button->setShortcut(QKeySequence());
         }