svx: fix VML export of rectangles imported from drawingML

This wasn't a problem before, as EnhancedCustomShapeTypeNames wasn't
involved for the export of rectangles, as those were handled in sw
directly.

CppunitTest_sw_ooxmlsdrexport's testFdo69636 is a reproducer for this
problem, the VML fallback part was empty due to this.

Change-Id: Ib2622fe05ddaa66bb3231977e30a8a1ca8748001

svx/source/customshapes/EnhancedCustomShapeTypeNames.cxx

@@ -240,7 +240,8 @@ static const NameTypeTable pNameTypeTableArray[] =
     { "mso-spt200", mso_sptActionButtonMovie },
     { "mso-spt201", mso_sptHostControl },
     { "mso-spt202", mso_sptTextBox },
-    { "teardrop",   mso_sptTearDrop }
+    { "teardrop",   mso_sptTearDrop },
+    { "ooxml-rect", mso_sptRectangle }
 };
 
     // gallery: quadrat