Branch link on branches page goes to tree view instead of commits

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

app/views/projects/branches/_branch.html.haml

 - commit = @repository.commit(branch.target)
 %li
   %h4
-    = link_to project_commits_path(@project, branch.name) do
+    = link_to project_tree_path(@project, branch.name) do
       %strong= truncate(branch.name, length: 60)
       - if branch.name == @repository.root_ref
         %span.label.label-info default