use simple decorate on single commits

app/controllers/merge_requests_controller.rb

@@ -94,12 +94,12 @@ class MergeRequestsController < ProjectResourceController
   def branch_from
     @commit = @repository.commit(params[:ref])
-    @commit = CommitDecorator.decorate_collection(@commit)
+    @commit = CommitDecorator.decorate(@commit)
   end
   def branch_to
     @commit = @repository.commit(params[:ref])
-    @commit = CommitDecorator.decorate_collection(@commit)
+    @commit = CommitDecorator.decorate(@commit)
   end
   def ci_status