bump ss number

Rakefile

@@ -19,7 +19,7 @@ namespace :test do
           begin
             matcher.each{|m| out[m] or raise("Couldn't match for #{m.inspect}")}
             real_size = Dir['*.png'].to_a.size
-            expected_size = 22
+            expected_size = 23
             raise("There are a weird number of screenshots, expected #{expected_size}, got #{real_size}") unless expected_size == real_size
             exit
           rescue