In Windows, if PropertySheet can't create some page it just skips it. This

In Windows, if PropertySheet can't create some page it just skips it. This
patch adds similar behaviour to Wine. It also adds some NULL checks.

<yuxi@corel.com>
Fix property sheet initialization bugs.

Matthew Robertson
The template was calling GetActiveIndex which was not being set in the
propsheet code, and the call was moved before we call SetActive -
because that's where we query for the Active Index.

Noomen Hamza
Resize property sheet to the largest dialog size.

Don Kelly
In the WM_INITDIALOG handler for the prop sheet, there is a call to
PROPSHEET_IsTooSmall() which, if it returns TRUE, calls
PROPSHEET_AdjustSize().  Contrary to its comment, .._AdjustSize() actually
aligns the sizes of the "largest" prop. sheet dialog template and the tab
control.  The IsTooSmall() call doesn't properly catch this mismatch.
Modified the function to return TRUE if the sizes mismatch and renamed it to
PROPSHEET_SizeMismatch() to reflect its proper use.