Related: tdf#135965 don't install accel group on adapter

it already has a suitable one in this case

Change-Id: I177e7c690ea91c82ac9a4e5fe21e40f2e2992992
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/101314
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/vcl/unx/gtk3/gtk3gtkinst.cxx b/vcl/unx/gtk3/gtk3gtkinst.cxx
index 480aa2ee..19cffc2 100644
--- a/vcl/unx/gtk3/gtk3gtkinst.cxx
+++ b/vcl/unx/gtk3/gtk3gtkinst.cxx
@@ -3923,11 +3923,15 @@ public:
        , m_pWindow(pWindow)
        , m_nToplevelFocusChangedSignalId(0)
    {
        //hook up F1 to show help
        GtkAccelGroup *pGroup = gtk_accel_group_new();
        GClosure* closure = g_cclosure_new(G_CALLBACK(help_pressed), this, nullptr);
        gtk_accel_group_connect(pGroup, GDK_KEY_F1, static_cast<GdkModifierType>(0), GTK_ACCEL_LOCKED, closure);
        gtk_window_add_accel_group(pWindow, pGroup);
        const bool bIsFrameWeld = pBuilder == nullptr;
        if (!bIsFrameWeld)
        {
            //hook up F1 to show help
            GtkAccelGroup *pGroup = gtk_accel_group_new();
            GClosure* closure = g_cclosure_new(G_CALLBACK(help_pressed), this, nullptr);
            gtk_accel_group_connect(pGroup, GDK_KEY_F1, static_cast<GdkModifierType>(0), GTK_ACCEL_LOCKED, closure);
            gtk_window_add_accel_group(pWindow, pGroup);
        }
    }

    virtual void set_title(const OUString& rTitle) override