Shows build scroll buttons after build is complete

Closes #18515

app/views/projects/builds/show.html.haml

@@ -48,16 +48,16 @@
     - if @build.active?
       .autoscroll-container
         %button.btn.btn-success.btn-sm#autoscroll-button{:type => "button", :data => {:state => 'disabled'}} enable autoscroll
-      #js-build-scroll.scroll-controls
-        = link_to '#build-trace', class: 'btn' do
-          %i.fa.fa-angle-up
-        = link_to '#down-build-trace', class: 'btn' do
-          %i.fa.fa-angle-down
     - if @build.erased?
       .erased.alert.alert-warning
         - erased_by = "by #{link_to @build.erased_by.name, user_path(@build.erased_by)}" if @build.erased_by
         Build has been erased #{erased_by.html_safe} #{time_ago_with_tooltip(@build.erased_at)}
     - else
+      #js-build-scroll.scroll-controls
+        = link_to '#build-trace', class: 'btn' do
+          %i.fa.fa-angle-up
+        = link_to '#down-build-trace', class: 'btn' do
+          %i.fa.fa-angle-down
       %pre.build-trace#build-trace
         %code.bash.js-build-output
         = icon("refresh spin", class: "js-build-refresh")