Merge requests API returns closed for closed and merged for merged.

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

CHANGELOG

@@ -7,6 +7,7 @@ v 7.13.0 (unreleased)
   - Rename "Design" profile settings page to "Preferences".
   - Allow users to customize their default Dashboard page.
   - Update ssl_ciphers in Nginx example to remove DHE settings. This will deny forward secrecy for Android 2.3.7, Java 6 and OpenSSL 0.9.8
+  - API request /projects/:project_id/merge_requests?state=closed will return only closed merge requests without merged one. If you need ones that were merged - use state=merged.  
 v 7.12.0 (unreleased)
   - Fix post-receive errors on a push when an external issue tracker is configured (Stan Hu)

spec/requests/api/merge_requests_spec.rb

@@ -49,9 +49,8 @@ describe API::API, api: true  do
         get api("/projects/#{project.id}/merge_requests?state=closed", user)
         expect(response.status).to eq(200)
         expect(json_response).to be_an Array
-        expect(json_response.length).to eq(2)
-        expect(json_response.second['title']).to eq(merge_request_closed.title)
-        expect(json_response.first['title']).to eq(merge_request_merged.title)
+        expect(json_response.length).to eq(1)
+        expect(json_response.first['title']).to eq(merge_request_closed.title)
       end
       it "should return an array of merged merge_requests" do