Fixes incorrect search scope for Redmine 3.2+

[jdkemme]

Refs #330

[archonwang]

I tested it on redmine 3.3.x with environment as follows

Environment: Redmine version 3.3.0.stable.15732 Ruby version 2.2.4-p230 (2015-12-16) [x86_64-linux] Rails version 4.2.6 Environment production Database adapter Mysql2 SCM: Subversion 1.6.11 Mercurial 1.4 Git 1.7.1 Filesystem
Redmine plugins: accept 0.0.2 advanced_roadmap 0.10.1 clipboard_image_paste 1.10 easy_wbs 2016-0.0 event_notifications 3.2.1 exception_notification 0.0.1 ez_assignee_founder 0.0.1 issue_charts 1.1.0 issue_table_macro 0.0.1 narrowdown 0.0.1 progressive_projects_list 3.0.1 quick_edit 0.0.9 redmine__select2 1.0.5 redmine_activity_report 1.2.6 redmine_assign_grouping 0.0.1 redmine_assignee_selector 0.0.1 redmine_banner 0.1.2 redmine_base_deface 0.0.1 redmine_base_select2 4.0.0 redmine_ckeditor 1.1.3 redmine_close_button 0.0.8 redmine_custom_reports 0.1.5 redmine_custom_values_projects 0.0.1 redmine_custom_workflows 0.1.6 redmine_dashboard 2.7.1 redmine_didyoumean 1.2.0 redmine_email_images 0.1.1 redmine_filter_assignable 0.0.1 redmine_graphs 0.1.0 redmine_helpdesk 0.0.15 redmine_highlightjs 1.0.3 redmine_html_diff 1.0.1 redmine_importer 1.2.2 redmine_information 1.0.2 redmine_introductions 0.1 redmine_issue_checklist 2.0.8 redmine_issue_evm 3.5.8 redmine_issue_favicon 0.0.1 redmine_issue_history_filter 0.0.1 redmine_issue_sla 1.0.0 redmine_issue_status_colors 0.0.1 redmine_issue_templates 0.1.2 redmine_issues_macros 0.0.1 redmine_issues_tree 0.0.7 redmine_knowledgebase 3.2.0 redmine_landing_page 1.0.0 redmine_lightbox2 0.2.5 redmine_local_avatars 0.2.0 redmine_login_attempts_limit 0.1.0 redmine_login_audit 0.3.0 redmine_logs 0.1.0 redmine_meeting 1.1.0 redmine_mentions 0.0.1 redmine_menu_links 1.0.2 redmine_message_issues 0.1.0 redmine_monitoring_controlling 0.1.1 redmine_my_page_queries 2.1.6 redmine_non_member_watcher 1.0.0 redmine_pivot_table 0.0.4 redmine_presentation 0.2 redmine_reminders 0.0.2 redmine_revision_diff 0.1.1 redmine_select2_inputs 0.0.1 redmine_show_issue_assignee_avatar 0.0.1 redmine_smile_togglesidebar 1.0.4 redmine_stats 0.0.3 redmine_status_history 1.0.0 redmine_tags 3.1.1 redmine_testlinklink 1.0.0 redmine_theme_changer 0.2.0 redmine_touch 0.0.3 redmine_user_import 0.1.0 redmine_version_email 3.0.0 redmine_vividtone_my_page_blocks 20150614 redmine_watcher_groups 0.0.1 redmine_wiki_books 0.0.5 redmine_wiki_issue_details 0.1.0 redmine_wiki_lists 0.0.6 redmine_wiki_notes 0.0.2 redmine_wiki_templates 0.2.0 redmine_work_time 0.3.2 redmine_workflow_enhancements 0.5.0 redmine_workflow_hidden_fields 0.3.0 redmine_xls_export 0.2.1.t9 release_logs 1.0.0 simple_author_change 0.1.2 spectator 0.0.2 view_customize 1.1.4 weekly 0.0.1 wiki_issue_fields 0.4.7

[alexbevi]

thanks @jdkemme @archonwang !