fdo#80498: vcl: Revert "fdo#74124: Scale the pictures before calling ...

... ImplDrawAlpha()."

This reverts commit 3cf3700b7a903e88f5296076c40ae854bce91cdc.

It may look nicer but is unusably slow when scrolling in Writer.

Conflicts:
	vcl/source/gdi/outdev2.cxx

Change-Id: I582f3f02a2f8915c244b04b2fe95b6af926396b9