FIX: ruby bench script no longer working

The library used to generate random text changed, this caused the title
of the topic used for testing to change, which meant the slug changed, so
a hit to the topic was a redirect

This fix gives the topic used for performance testing a static name to avoid
this issue in future

script/bench.rb

@@ -231,7 +231,7 @@ begin
   tests = [
     ["categories", "/categories"],
     ["home", "/"],
-    ["topic", "/t/oh-how-i-wish-i-could-shut-up-like-a-tunnel-for-so/179"]
+    ["topic", "/t/i-am-a-topic-used-for-perf-tests/179"]
     # ["user", "/u/admin1/activity"],
   ]
 

script/profile_db_generator.rb

@@ -62,9 +62,17 @@ unless Rails.env == "profile"
   exit
 end
 
+def ensure_perf_test_topic_has_right_title!
+  t = Topic.find(179)
+  t.title = "I am a topic used for perf tests"
+  t.save! if t.title_changed?
+end
+
 # by default, Discourse has a "system" and `discobot` account
 if User.count > 2
   puts "Only run this script against an empty DB"
+
+  ensure_perf_test_topic_has_right_title!
   exit
 end
 
@@ -110,3 +118,5 @@ end
 # no sidekiq so update some stuff
 Category.update_stats
 Jobs::PeriodicalUpdates.new.execute(nil)
+
+ensure_perf_test_topic_has_right_title!