Fixed issue with lines not being selectable when expanding diff

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

 - if @lines.present?
   - if @form.unfold? && @form.since != 1 && !@form.bottom?
-    %tr.line_holder{ id: @form.since }
+    %tr.line_holder
       = render "projects/diffs/match_line", { line: @match_line,
         line_old: @form.since, line_new: @form.since, bottom: false, new_file: false }
 
   - @lines.each_with_index do |line, index|
     - line_new = index + @form.since
     - line_old = line_new - @form.offset
-    %tr.line_holder
+    %tr.line_holder{ id: line_old }
       %td.old_line.diff-line-num{ data: { linenumber: line_old } }
-        = link_to raw(line_old), "#"
-      %td.new_line.diff-line-num{ data: { linenumber: line_old } }
-        = link_to raw(line_new) , "#"
+        = link_to raw(line_old), "##{line_old}"
+      %td.new_line.diff-line-num
+        = link_to raw(line_new) , "##{line_old}"
       %td.line_content.noteable_line==#{' ' * @form.indent}#{line}
 
   - if @form.unfold? && @form.bottom? && @form.to < @blob.loc