Remove Finch logging preferences but add Credential Provider preference.

The logging preferences were removed because they were removed when the History API was merged, but their Finch UI remained. Also there's currently no preference for the history adapter so no reason to put it in now.

Testing Done:
Opened the preference window in finch and made sure the settings saved.

Reviewed at
/* pidgin
* Pidgin is the legal property of its developers, whose names are too numerous
* to list here. Please refer to the COPYRIGHT file distributed with this
* source distribution.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
# error "only <pidgin.h> may be included directly"
#include <purple.h>
* pidgin_roomlist_init:
* Initializes the room list subsystem.
void pidgin_roomlist_init(void);
* pidgin_roomlist_is_showable:
* Determines if showing the room list dialog is a valid action.
* Returns: TRUE if there are accounts online that support listing
* chat rooms. Otherwise return FALSE.
gboolean pidgin_roomlist_is_showable(void);
* pidgin_roomlist_dialog_show:
* Shows a new roomlist dialog.
void pidgin_roomlist_dialog_show(void);
* pidgin_roomlist_dialog_show_with_account:
* @account: The account to use.
* Shows a new room list dialog and fetches the list for the specified account.
void pidgin_roomlist_dialog_show_with_account(PurpleAccount *account);
#endif /* _PIDGINROOMLIST_H_ */