Fix : Properties view page missing vertical scroll bar when first opened

If a properties view page contains a table property editor with a detail
section that itself contains a table property editor, the vertical
scroll bar is not properly adjusted to allow the table in the detail
section to fully show when the properties view page is first opened.
This only occurrs if the top table property editor has entries in it
before it is opened.

Bugzilla: https://bugs.eclipse.org/bugs/show_bug.cgi?id=448148