main/profile_select: Don't prompt for profile selection when only one is available

src/yuzu/main.cpp

@@ -278,6 +278,9 @@ GMainWindow::~GMainWindow() {
 }
 
 void GMainWindow::ProfileSelectorSelectProfile() {
+    const Service::Account::ProfileManager manager;
+    int index = 0;
+    if (manager.GetUserCount() != 1) {
         QtProfileSelectionDialog dialog(this);
         dialog.setWindowFlags(Qt::Dialog | Qt::CustomizeWindowHint | Qt::WindowTitleHint |
                               Qt::WindowSystemMenuHint | Qt::WindowCloseButtonHint);
@@ -286,9 +289,10 @@ void GMainWindow::ProfileSelectorSelectProfile() {
             emit ProfileSelectorFinishedSelection(std::nullopt);
             return;
         }
+        index = dialog.GetIndex();
+    }
 
-    Service::Account::ProfileManager manager;
-    const auto uuid = manager.GetUser(static_cast<std::size_t>(dialog.GetIndex()));
+    const auto uuid = manager.GetUser(static_cast<std::size_t>(index));
     if (!uuid.has_value()) {
         emit ProfileSelectorFinishedSelection(std::nullopt);
         return;