fix(e2ee): ensure PIN input dialog is top most window

Signed-off-by: Matthieu Gallien <matthieu.gallien@nextcloud.com>

Author: mgallien

src/libsync/clientsideencryption.cpp

@@ -1193,7 +1193,8 @@ void ClientSideEncryption::initializeHardwareTokenEncryption(QWidget *settingsDi
                                                tr("Enter Certificate USB Token PIN:"),
                                                QLineEdit::Password,
                                                {},
-                                               &ok);
+                                               &ok,
+                                               Qt::WindowStaysOnTopHint | Qt::X11BypassWindowManagerHint);
                 if (!ok || newPin.isEmpty()) {
                     qCWarning(lcCse()) << "an USER pin is required";