Replace some icons with better choices from FA6

app/views/actions/_question.html.haml

@@ -13,10 +13,10 @@
       = t("voc.block")
     - if current_user.mod?
       = button_to anonymous_block_path, method: :post, params: { question: question.id, global: true }, class: "dropdown-item" do
-        %i.fa.fa-fw.fa-volume-off
+        %i.fas.fa-fw.fa-user-slash
         = t("voc.block_site_wide")
       %a.dropdown-item{ href: moderation_questions_path(author_identifier: question.author_identifier) }
-        %i.fa.fa-fw.fa-user-secret
+        %i.fas.fa-fw.fa-mask
         = t("voc.show_anonymous_questions")
   - if current_user.admin?
     %a.dropdown-item{ href: rails_admin_path_for_resource(question), target: "_blank" }

app/views/answerbox/_header.html.haml

@@ -12,7 +12,7 @@
             = render "actions/question", question: a.question
       %h6.text-muted.media-heading.answerbox__question-user
         - if a.question.author_is_anonymous
-          %i.fa.fa-user-secret{ title: t(".anon_hint") }
+          %i.fas.fa-mask{ title: t(".anon_hint") }
         = t(".asked_html", user: user_screen_name(a.question.user, context_user: a.user, author_identifier: a.question.author_is_anonymous ? a.question.author_identifier: nil), time: time_tooltip(a.question))
         - if !a.question.author_is_anonymous && !a.question.direct
           ·

app/views/inbox/_entry.html.haml

@@ -7,7 +7,7 @@
       .media-body
         %h6.text-muted.media-heading.answerbox__question-user
           - if i.question.author_is_anonymous
-            %i.fa.fa-user-secret{ title: t('.anon_hint') }
+            %i.fas.fa-mask{ title: t('.anon_hint') }
           = t(".asked_html", user: user_screen_name(i.question.user, context_user: i.user, author_identifier: i.question.author_is_anonymous ? i.question.author_identifier : nil), time: time_tooltip(i.question))
           - if !i.question.author_is_anonymous && i.question.answer_count.positive?
             ·