I18n's short format for times differs from "%b %e", update test (#16414)

This passed in the branch because the last commit was on a two digit
day (so the digit padding wasn't needed or expected, it checked "Jan 30" ==
"Jan 30", but today "Feb 4" != "Feb  4")

spec/models/article_spec.rb

@@ -632,7 +632,7 @@ RSpec.describe Article, type: :model do
     it "does not show year in readable time if not current year" do
       time_now = Time.current
       article.edited_at = time_now
-      expect(article.readable_edit_date).to eq(time_now.strftime("%b %e"))
+      expect(article.readable_edit_date).to eq(I18n.l(article.edited_at, format: :short))
     end
 
     it "shows year in readable time if not current year" do