Fix tests

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

app/assets/stylesheets/sections/merge_requests.scss

@@ -170,7 +170,3 @@
 .merge-request-show-labels .label {
   padding: 6px 10px;
 }
-
-.mr-commits .commit {
-  padding: 10px 15px;
-}

features/steps/project/merge_requests.rb

@@ -113,7 +113,7 @@ class Spinach::Features::ProjectMergeRequests < Spinach::FeatureSteps
       click_link 'Commits'
     end
 
-    within '.mr-commits' do
+    within '.commits' do
       click_link Commit.truncate_sha(sample_commit.id)
     end
   end