Have a routine to create a scrolled window, set its vertical scrollbar

preference, and add it to the list of scrolled windows; call that
routine to create scrolled windows, rather than creating it and calling
other routines to do the other two operations.

As "set_scrollbar_placement_all()" and "set_ctree_styles_all()" always
set the styles to match the user's preference, don't have them take an
argument, have them just use the user's preference settings.

Get rid of unnecessary includes of "prefs_dlg.h", replacing them with
includes of "prefs.h" if necessary.  Don't have "prefs_dlg.h" include
"prefs.h" - its sole purpose is to declare routines defined in
"prefs_dlg.c" - and add any additional includes of "prefs.h" this
requires.

Get rid of unnecessary includes of "prefs.h" and "gtkglobals.h".

Fix up white space.


git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@4521 f5534014-38df-0310-8fa8-9805f1628bb7

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