Enable Lint/RedundantWithIndex cop for HAML

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

.haml-lint.yml

@@ -119,7 +119,6 @@ linters:
       - Lint/BooleanSymbol
       - Lint/LiteralInInterpolation
       - Lint/ParenthesesAsGroupedExpression
-      - Lint/RedundantWithIndex
       - Lint/SafeNavigationConsistency
       - Metrics/BlockNesting
       - Naming/VariableName

app/views/admin/projects/_projects.html.haml

 .js-projects-list-holder
   - if @projects.any?
     %ul.projects-list.content-list.admin-projects
-      - @projects.each_with_index do |project|
+      - @projects.each do |project|
         %li.project-row{ class: ('no-description' if project.description.blank?) }
           .controls
             = link_to _('Edit'), edit_project_path(project), id: "edit_#{dom_id(project)}", class: "btn gl-button btn-default"