Change SfxTabPage ctor SfxItemSet param from ref to pointer

...and also corresponding param of CreateTabPage function type and corresponding
Craete functions.  There were some call sites that passed undefined "null
pointer references" and SfxTabPage internally uses a pointer member pSet that is
checked for null anyway.

Change-Id: I4eb3636155eac46c9c9d26e6e6e842e85d7e95af