Block custom_package_items if they exist in user.conf

Version 1.61.1

Bugfix
Finished

Scenario when the custom_package_items.conf has an index which is a duplicate of the user.conf. This caused a display error due to the double index. For example, if "language" is used in the custom_package_items.conf, with this fix, DA will ignore it, and add to error.log: 2020:05:27-17:18:08: Package::get_custom_file:./data/admin/custom_package_items.conf: Contains 'language' which conflicts with a member of the user.conf file in the User class to prevent the display issue. ---- T26849 EVO1911

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