UEF - with plugin EUF_DB_FIELD there is always false error message when uninstalling plugin + FIX

[Jimmi08]

Bug Description

There is no check if EUF_DB_FIELD is core or plugin

so this is always false:

			if($status && $type == EUF_DB_FIELD') != 0) 
			{
 
				$status = $this->manage_extended_field_sql('remove', $field_attrib['name']);
			}