Call SetOutputSizePixel() in the iOS case, too

Change-Id: I844901f38ec1d93f4183e0678741fecdc7636139
(cherry picked from commit 65da08ea)
Signed-off-by: Michael Meeks <michael.meeks@collabora.com>

desktop/source/lib/init.cxx

@@ -2104,6 +2104,8 @@ static void doc_paintTile(LibreOfficeKitDocument* pThis,
     // the Size argument is irrelevant, I hope
     ScopedVclPtrInstance<VirtualDevice> pDevice(&aData, Size(1, 1), DeviceFormat::DEFAULT);
 
+    pDevice->SetOutputSizePixel(Size(nCanvasWidth, nCanvasHeight));
+
     pDoc->paintTile(*pDevice.get(), nCanvasWidth, nCanvasHeight,
                     nTilePosX, nTilePosY, nTileWidth, nTileHeight);
 #else