Fix vertical align for files tab top navigation

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/pages/projects.scss

@@ -222,7 +222,7 @@
   padding: 0;
   background: transparent;
   border: none;
-  line-height: 42px;
+  line-height: 36px;
   margin: 0;
 
   > li + li:before {

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

@@ -2,7 +2,7 @@
 - header_title project_title(@project, "Files", project_files_path(@project))
 
 .file-finder-holder.tree-holder.clearfix
-  .gray-content-block.top-block
+  .nav-block
     .tree-ref-holder
       = render 'shared/ref_switcher', destination: 'find_file', path: @path
     %ul.breadcrumb.repo-breadcrumb