Revert "fix build without graphics context"

This reverts commit 44c91fedb8 which is
not necessary for wxQt any more as wxGraphicsContext is available for it
now and didn't make much sense because wxActivityIndicator just can't be
used without wxGraphicsContext, so a proper fix would be to disable the
former completely if the latter is unavailable.

src/generic/activityindicator.cpp

@@ -122,7 +122,7 @@ private:
     void OnPaint(wxPaintEvent& WXUNUSED(event))
     {
         wxPaintDC pdc(m_win);
-#if wxUSE_GRAPHICS_CONTEXT
+
         wxScopedPtr<wxGraphicsContext> const
             gc(wxGraphicsRenderer::GetDefaultRenderer()->CreateContext(pdc));
 
@@ -167,7 +167,6 @@ private:
             gc->FillPath(path);
             gc->Rotate(angle);
         }
-#endif        
     }
 
     AdvanceTimer m_timer;