Rename displaying_blame to blame

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

@@ -7,7 +7,7 @@
 
   #blob-content-holder.tree-holder
     .file-holder
-      = render "projects/blob/header", blob: @blob, displaying_blame: true
+      = render "projects/blob/header", blob: @blob, blame: true
 
       .table-responsive.file-content.blame.code.js-syntax-highlight
         %table

app/views/projects/blob/_header.html.haml

-- displaying_blame = local_assigns.fetch(:displaying_blame, false)
+- blame = local_assigns.fetch(:blame, false)
 .js-file-title.file-title-flex-parent
   .file-header-content
     = blob_icon blob.mode, blob.name
@@ -13,14 +13,14 @@
 
   .file-actions.hidden-xs
     .btn-group{ role: "group" }<
-      = copy_blob_content_button(blob) if !displaying_blame && blob_text_viewable?(blob)
+      = copy_blob_content_button(blob) if !blame && blob_text_viewable?(blob)
       = open_raw_file_button(namespace_project_raw_path(@project.namespace, @project, @id))
       = view_on_environment_button(@commit.sha, @path, @environment) if @environment
 
     .btn-group{ role: "group" }<
       -# only show normal/blame view links for text files
       - if blob_text_viewable?(blob)
-        - if displaying_blame
+        - if blame
           = link_to 'Normal view', namespace_project_blob_path(@project.namespace, @project, @id),
               class: 'btn btn-sm'
         - else