Update methods that use issue close service

`Issues::CloseService#execute` signature has changed, because of using
keyword parameter for commmit.

app/services/git_push_service.rb

@@ -120,7 +120,7 @@ class GitPushService < BaseService
         closed_issues = commit.closes_issues(current_user)
         closed_issues.each do |issue|
           if can?(current_user, :update_issue, issue)
-            Issues::CloseService.new(project, authors[commit], {}).execute(issue, commit)
+            Issues::CloseService.new(project, authors[commit], {}).execute(issue, commit: commit)
           end
         end
       end

app/services/issues/close_service.rb

 module Issues
   class CloseService < Issues::BaseService
-    def execute(issue, commit = nil, notifications: true, system_note: true)
+    def execute(issue, commit: nil, notifications: true, system_note: true)
       if project.jira_tracker? && project.jira_service.active
         project.jira_service.execute(commit, issue)
         todo_service.close_issue(issue, current_user)

app/services/merge_requests/post_merge_service.rb

@@ -22,7 +22,7 @@ module MergeRequests
       closed_issues = merge_request.closes_issues(current_user)
       closed_issues.each do |issue|
         if can?(current_user, :update_issue, issue)
-          Issues::CloseService.new(project, current_user, {}).execute(issue, merge_request)
+          Issues::CloseService.new(project, current_user, {}).execute(issue, commit: merge_request)
         end
       end
     end