FIX: S3 endpoint broke bucket creation in non-default region

lib/s3_helper.rb

@@ -193,10 +193,11 @@ class S3Helper
   def self.s3_options(obj)
     opts = {
       region: obj.s3_region,
-      endpoint: SiteSetting.s3_endpoint,
       force_path_style: SiteSetting.s3_force_path_style
     }
 
+    opts[:endpoint] = SiteSetting.s3_endpoint if SiteSetting.s3_endpoint.present?
+
     unless obj.s3_use_iam_profile
       opts[:access_key_id] = obj.s3_access_key_id
       opts[:secret_access_key] = obj.s3_secret_access_key