Don't group projects on dashboard#issues

app/views/shared/_issues.html.haml

 - if @issues.to_a.any?
-  - @issues.group_by(&:project).each do |group|
   .panel.panel-default.panel-small
-      - project = group[0]
-      .panel-heading
-        = link_to project.name_with_namespace, namespace_project_issues_path(project.namespace, project)
-        - if can?(current_user, :create_issue, project)
-          .pull-right
-            = link_to 'New issue', new_namespace_project_issue_path(project.namespace, project)
-
     %ul.content-list.issues-list
-        - group[1].each do |issue|
+      - @issues.each do |issue|
+        - project = issue.project
+
         = render 'projects/issues/issue', issue: issue
   = paginate @issues, theme: "gitlab"
 - else