Revert "disable force_ssl as a test to fix Render startup failures"

This reverts commit 92430dab93.

config/environments/production.rb

@@ -51,7 +51,7 @@ Rails.application.configure do
   # config.assume_ssl = true
 
   # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
-  config.force_ssl = false
+  config.force_ssl = true
 
   # Log to STDOUT by default
   config.logger = ActiveSupport::Logger.new(STDOUT)