Move a begin/rescue clause to ApplicationSetting.expire

Also, remove non-existing Ci::ApplicationSetting.expire!
Signed-off-by: Rémy Coutable <remy@rymai.me>

app/models/application_setting.rb

@@ -218,6 +218,9 @@ class ApplicationSetting < ActiveRecord::Base
 
   def self.expire
     Rails.cache.delete(CACHE_KEY)
+  rescue
+    # Gracefully handle when Redis is not available. For example,
+    # omnibus may fail here during assets:precompile.
   end
 
   def self.cached

config/initializers/1_settings.rb

@@ -531,10 +531,4 @@ if Rails.env.test?
 end
 
 # Force a refresh of application settings at startup
-begin
-  ApplicationSetting.expire
-  Ci::ApplicationSetting.expire
-rescue
-  # Gracefully handle when Redis is not available. For example,
-  # omnibus may fail here during assets:precompile.
-end
+ApplicationSetting.expire