ems_id cannot be an array, simplifying this logic

ems_id comes from ems_id_from_queue_name which as of [1] can only ever return an
integer or nil from parse_ems_id.

[1] ManageIQ#20345

app/models/miq_worker/container_common.rb

@@ -108,7 +108,7 @@ def deployment_prefix
     def worker_deployment_name
       @worker_deployment_name ||= begin
         deployment_name = abbreviated_class_name.dup.chomp("Worker").sub("Manager", "").sub(/^Miq/, "")
-        deployment_name << "-#{Array(ems_id).map { |id| ApplicationRecord.split_id(id).last }.join("-")}" if respond_to?(:ems_id) && ems_id.present?
+        deployment_name << "-#{ApplicationRecord.split_id(ems_id).last}" if respond_to?(:ems_id) && ems_id.kind_of?(Fixnum)
         "#{deployment_prefix}#{deployment_name.underscore.dasherize.tr("/", "-")}"
       end
     end