Remove unnecessary ivars

There's no need for these to be ivars because they are not accessed
anywhere else and also they aren't memoized. This commits switches them
to be local vars.

Author: Fryguy

app/helpers/ops_helper.rb

@@ -22,19 +22,19 @@ def row_data(label, value)
   end
 
   def database_details
-    @database_details = ActiveRecord::Base.configurations.configs_for(:env_name => Rails.env).first.configuration_hash
-    @database_display_name =
-      if @database_details[:host].in?([nil, "", "localhost", "127.0.0.1"])
+    details = ActiveRecord::Base.configurations.configs_for(:env_name => Rails.env).first.configuration_hash
+    display_name =
+      if details[:host].in?([nil, "", "localhost", "127.0.0.1"])
         _("Internal Database")
       else
         _("External Database")
       end
       @data = {:title => _('Basic Information')}
       @data[:rows] = [
-        row_data(_('Name'), @database_display_name),
-        row_data(_('Hostname'), @database_details[:host]),
-        row_data(_('Database name'), @database_details[:database]),
-        row_data(_('Username'), @database_details[:username])
+        row_data(_('Name'), display_name),
+        row_data(_('Hostname'), details[:host]),
+        row_data(_('Database name'), details[:database]),
+        row_data(_('Username'), details[:username])
       ]
   end