Use confirm variant for new wiki template

Changelog: changed

app/views/shared/wikis/_main_links.html.haml

 - if @page&.persisted?
   - if can?(current_user, :create_wiki, @wiki.container)
     - if @page.template?
-      = link_button_to wiki_page_path(@wiki, "#{Wiki::TEMPLATES_DIR}/#{SecureRandom.uuid}", random_title: true), icon: 'plus' do
+      = link_button_to wiki_page_path(@wiki, "#{Wiki::TEMPLATES_DIR}/#{SecureRandom.uuid}", random_title: true), variant: :confirm do
         = s_("Wiki|New template")
     - else
       = link_button_to wiki_path(@wiki, action: :new), role: "button", data: { testid: 'new-page-button' }, variant: :confirm, category: :secondary do

app/views/shared/wikis/templates.html.haml

@@ -8,7 +8,7 @@
     = s_("Wiki|Wiki Templates")
 
   .nav-controls.pb-md-3.pb-lg-0
-    = link_button_to wiki_page_path(@wiki, "#{Wiki::TEMPLATES_DIR}/#{SecureRandom.uuid}", random_title: true), icon: 'plus' do
+    = link_button_to wiki_page_path(@wiki, "#{Wiki::TEMPLATES_DIR}/#{SecureRandom.uuid}", random_title: true), variant: :confirm do
       = s_("Wiki|New template")
 
     .dropdown.inline.wiki-sort-dropdown