check if edit can be enabled after setting cursor into tree

Change-Id: I264dc4db7e3ddc64faf0edec18d96d2c46ce00f3
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89459
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

basctl/source/basicide/moduldlg.cxx

@@ -577,6 +577,7 @@ ObjectPage::~ObjectPage()
 void ObjectPage::ActivatePage()
 {
     m_xBasicBox->UpdateEntries();
+    CheckButtons();
 }
 
 void ObjectPage::CheckButtons()