Fixed rubocop issues

app/helpers/issuables_helper.rb

@@ -48,11 +48,12 @@ module IssuablesHelper
   end
   def milestone_dropdown_label(milestone_title, default_label)
-    milestone_title = if milestone_title == Milestone::Upcoming.name
-      Milestone::Upcoming.title
-    else
-      milestone_title
-    end
+    milestone_title =
+      if milestone_title == Milestone::Upcoming.name
+        Milestone::Upcoming.title
+      else
+        milestone_title
+      end
     if !milestone_title.nil? && !milestone_title.empty?
       h(milestone_title)