use SvxExtNumType in SvxNumberType

and follow the rabbit trail, fixing various other types in the process

Change-Id: I8fc7df3b585df21578ffb28fdd7e5e427b3bfd9d
Reviewed-on: https://gerrit.libreoffice.org/34814
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

filter/source/msfilter/svdfppt.cxx

@@ -3663,6 +3663,7 @@ void PPTNumberFormatCreator::GetNumberFormat( SdrPowerPointImport& rManager, Svx
             }
         }
         break;
+        default: break;
     }
 }
 
@@ -3723,6 +3724,7 @@ bool PPTNumberFormatCreator::GetNumberFormat( SdrPowerPointImport& rManager, Svx
                 }
             }
             break;
+            default: break;
         }
     }
     return nHardCount != 0;