tdf#141136 NBB SetContext: don't SetCurPageId twice for the same page

I noticed that SetCurPageId was running multiple times
for the HomeLabel page.

Plus, let's flatten this a bit more.

It has always been like since, since
commit d7da58ae362b661c03fc754e4e8f4a89798b0127
Author: Szymon Kłos on Fri Jul 22 11:50:57 2016 +0200
    GSoC notebookbar: better default page handling

Change-Id: Ied13ea5019df7cce2afe38d5d5d3615168338f0e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/153475
Tested-by: Jenkins
Reviewed-by: Justin Luth <jluth@mail.com>
diff --git a/vcl/source/control/tabctrl.cxx b/vcl/source/control/tabctrl.cxx
index fd6f53d..c384cb0 100644
--- a/vcl/source/control/tabctrl.cxx
+++ b/vcl/source/control/tabctrl.cxx
@@ -2290,22 +2290,22 @@ void NotebookbarTabControlBase::SetContext( vcl::EnumContext::Context eContext )
        sal_uInt16 nPageId = TabControl::GetPageId(nChild);
        TabPage* pPage = GetTabPage(nPageId);

        if (pPage)
        if (!pPage)
            continue;

        SetPageVisible(nPageId, pPage->HasContext(eContext) || pPage->HasContext(vcl::EnumContext::Context::Any));

        if (pPage->HasContext(eContext) && eContext != vcl::EnumContext::Context::Any)
        {
            SetPageVisible(nPageId, pPage->HasContext(eContext) || pPage->HasContext(vcl::EnumContext::Context::Any));
            SetCurPageId(nPageId);
            bHandled = true;
            bLastContextWasSupported = true;
        }

            if (!bHandled && bLastContextWasSupported
                && pPage->HasContext(vcl::EnumContext::Context::Default))
            {
                SetCurPageId(nPageId);
            }

            if (pPage->HasContext(eContext) && eContext != vcl::EnumContext::Context::Any)
            {
                SetCurPageId(nPageId);
                bHandled = true;
                bLastContextWasSupported = true;
            }
        if (!bHandled && bLastContextWasSupported
            && pPage->HasContext(vcl::EnumContext::Context::Default))
        {
            SetCurPageId(nPageId);
        }
    }