unifies mr diff file button style

app/helpers/commits_helper.rb

@@ -198,7 +198,7 @@ module CommitsHelper
     link_to(
       namespace_project_blob_path(project.namespace, project,
                                   tree_join(commit_sha, diff_new_path)),
-      class: 'btn view-file js-view-file btn-file-option'
+      class: 'btn view-file js-view-file'
     ) do
       raw('View file @') + content_tag(:span, commit_sha[0..6],
                                        class: 'commit-short-id')

app/views/projects/diffs/_file.html.haml

@@ -5,7 +5,7 @@
     - unless diff_file.submodule?
       .file-actions.hidden-xs
         - if blob_text_viewable?(blob)
-          = link_to '#', class: 'js-toggle-diff-comments btn active has-tooltip btn-file-option', title: "Toggle comments for this file", disabled: @diff_notes_disabled do
+          = link_to '#', class: 'js-toggle-diff-comments btn active has-tooltip', title: "Toggle comments for this file", disabled: @diff_notes_disabled do
             = icon('comment')
           \
           - if editable_diff?(diff_file)