Drop projects order in IssuableFinder

When grabbing the projects to filter issues by we don't care about the
order they're returned in. By removing the ORDER BY the resulting query
can be quite a bit faster.

app/finders/issuable_finder.rb

@@ -79,9 +79,9 @@ class IssuableFinder
     if project?
       @projects = project
     elsif current_user && params[:authorized_only].presence && !current_user_related?
-      @projects = current_user.authorized_projects
+      @projects = current_user.authorized_projects.reorder(nil)
     else
-      @projects = ProjectsFinder.new.execute(current_user)
+      @projects = ProjectsFinder.new.execute(current_user).reorder(nil)
     end
   end