Fix migration for SSH key expiration enforcement

This fixes a bug in the migration to enable SSH key expiration
enforcement by default. Specifically, this fixes a bug that caused
no ApplicationSetting record to be selected for update with the
new value.

Changelog: fixed

db/migrate/20210531071107_enable_enforce_ssh_key_expiration.rb

@@ -8,7 +8,7 @@ class EnableEnforceSshKeyExpiration < ActiveRecord::Migration[6.0]
   def up
     ApplicationSetting.reset_column_information
 
-    ApplicationSetting.where.not(enforce_ssh_key_expiration: false).each do |application_setting|
+    ApplicationSetting.where.not(enforce_ssh_key_expiration: true).each do |application_setting|
       application_setting.update!(enforce_ssh_key_expiration: true)
     end
   end