vcl: fix logic size of metafile from Graphicdistro/vector/vector-5.4

vector-7.0 has bitmap import filters which set both the preferred size
and the preferred pixel size on a BitmapEx. This means that when
ImpGraphic::ImplGetGDIMetaFile() gets the bitmap size, it can use
maEx.GetPrefSize() directly.

Interestingly, the "fall back to pixel size from logic size" logic is
still there at other places, e.g. at ImpGraphic::ImplGetPrefSize().

However, on this branch, the bitmap import filters (e.g. PNG import)
only sets the preferred pixel size and set the map mode to pixel. This
means that directly getting the preferred size results in a zero size,
so exporting such a bitmap to WMF/EMF will result in a white rectangle.

Fix the problem by using ImplGetPrefSize() (which has the fallback
logic) instead of maEx.GetPrefSize() directly -- both for the metafile
action and for the preferred size of the metafile.

Change-Id: I94090b2e125c0262d4d6d408c8e4d894a0de8872

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