IsDraw doesn't mean the app/page is Draw

it means a slide in impress.

commit 7b31e45ec7106d2cfbdbb7915d97667ba710f81c
Date:   Mon Jun 23 20:55:21 2014 +0100
    Make Draw use paper size when printing - fdo#63905

    Previously, Draw/Impress use the default size from the printer.
    Now Draw uses the paper size (specified in page formatting).
    Impress still uses the old method - not sure if this is correct
    but printing handouts etc probably complicate print/paper size.

suggests the intent is for this to not affect Impress and to only
affect Draw, so this does that

(cherry picked from commit f1f89f0202232635e7fbbd7ca47de51755b2bce0)

Conflicts:
	sd/source/ui/view/DocumentRenderer.cxx

Change-Id: I481a824ef244fd837992c893f6de0c051af0a26b
Reviewed-on: https://gerrit.libreoffice.org/11511
Reviewed-by: Matúš Kukan <matus.kukan@collabora.com>
Tested-by: Matúš Kukan <matus.kukan@collabora.com>