Apparent typo when adding braces

...in 4707f7bb54d143e642ad5df5eedf56d5d2b08385 "CWS-TOOLING: integrate CWS
cmcfixes51"

Change-Id: Icc8b2ed48d73f3f03c2820f554f896f6edb15e23
Assume nPageNum shall be compared against 0 or 1 here

...depending on DOCUMENT_TYPE_IMPRESS, similar to how the nPgNum argument to the
SdDrawDocument::GetMasterSdPage call a few lines up is computed.

Change-Id: I8a13ac72868d96d486c071a4a705268dd888c1eb
StartPresentationMode nFlags takes PRESENTATION_* values

Change-Id: Ib922ebf1e547ff4d02c4fbaac6e6a81313a036ec