[pvr] improvements/cleanups for the search window

* removes item 'no search results' and adds a new item 'Search ...'
which do not disappear if the results are shown
* renames ShowSearchResults() to OpenDialogSearch() as we don't show
results, we show the dialog to define the search settings
* refactor method Search() into OnPrepareFileItems()
* removes some needless methods/vars like ActionShowSearch()

@Jalle19 or @opdenkamp mind taking a look
Pretty sure this is still valid!

> Op 1 aug. 2014 om 08:41 heeft Sascha Woo <notifications@github.com> het volgende geschreven:
> 
> In xbmc/pvr/windows/GUIWindowPVRSearch.cpp:
> 
> > @@ -142,34 +150,22 @@ void CGUIWindowPVRSearch::Search(void)
> >      if (dlgProgress)
> >      {
> >        dlgProgress->SetHeading(194);
> > -      dlgProgress->SetLine(0, m_searchfilter.m_strSearchTerm);
> > -      dlgProgress->SetLine(1, "");
> > -      dlgProgress->SetLine(2, "");
> > +      dlgProgress->SetText(CVariant(m_searchfilter.m_strSearchTerm));
> >        dlgProgress->StartModal();
> >        dlgProgress->Progress();
> >      }
> >  
> >      // TODO get this from the selected channel group
> no not necessary, i'll remove it
> 
> —
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